I am new to this site and hoping to be new to this hobby soon. I am posting this looking for help on deciding where to start with my aquarium. I have always wanted a nice saltwater aquarium but now that I am seriously looking into it I am feeling very overwhelmed with everything I am reading and all the decisions to make. I am having a hard time just sitting down and reading a huge amount of posts and also having a hard time trying to read through long guides on how to start things up. I am hoping to get some advice on everything from where I am (not even owning an aquarium but potentially buying one tomorrow) to how to set it up, etc. Please be patient with me as I know next to nothing to start with.
So here is my first question. I know someone that has had a saltwater aquarium set up in his house for years. He was given the aquarium originally and has now been given a larger aquarium, which he has transferred his sand, rocks and fish to, so he is willing to sell me everything he has without any sand or rocks or fish in it (75 gallon tall aquarium, cabinet, filters, power heads, light fixture with a burnt out bulb, heater, etc.) for $100. He has had a successful aquarium set up for years and this is everything he used. He did tell me he does not have a sump on this tank and I am not sure about an overflow so my first question is if this is worth it and are the overflow and sump necessary? If so what exactly do they do and can I install them later? What all should I be looking for to make sure I am getting what he is saying I am getting and that I have everything I need?
My second question is that I am trying to figure out what type of aquarium I want and am told that for the fish we are interested in to just do a fish only with live rock tank and add coral in the future if I am interested in it later. They will be fine with coral but I am told that it is more work so to start with this. Apparently the light fixture that comes with this tank will support coral from what I am told although he only used live rock and never did the coral (again I have no idea about any of this so all of this is just hearsay for now). So I hear that the first thing I have to do after placing the tank is to cycle it. This is another thing that really confuses me. I see that dry rock is much cheaper than live rock and it looks like it does not have any parasites, etc. that can be damaging to the tank in it. Will the dry rock become live rock over time and what do I do with the dry rock before putting it in the tank? Is there any advice on what to do with this and how to cycle the tank as well as how to turn dry rock into live rock if it is more than just waiting for it to happen? Maybe a very short, step-by-step guide to cycling a saltwater tank for dummies, maybe including a timeline for each step? I can be patient to get the tank how I want it and am happy to put in the work if I know what to do. Also, along with the previous question about the rock, do I need live sand or dry sand, what type and how much? I guess some of the fish that we are interested in burrow in the sand.
Anyway, please help answer the above questions if you have any advice. Like I said, I know next to nothing about this. Thank you in advance for your help and I am sure that after I have done this I will be coming back for more help as well.
So here is my first question. I know someone that has had a saltwater aquarium set up in his house for years. He was given the aquarium originally and has now been given a larger aquarium, which he has transferred his sand, rocks and fish to, so he is willing to sell me everything he has without any sand or rocks or fish in it (75 gallon tall aquarium, cabinet, filters, power heads, light fixture with a burnt out bulb, heater, etc.) for $100. He has had a successful aquarium set up for years and this is everything he used. He did tell me he does not have a sump on this tank and I am not sure about an overflow so my first question is if this is worth it and are the overflow and sump necessary? If so what exactly do they do and can I install them later? What all should I be looking for to make sure I am getting what he is saying I am getting and that I have everything I need?
My second question is that I am trying to figure out what type of aquarium I want and am told that for the fish we are interested in to just do a fish only with live rock tank and add coral in the future if I am interested in it later. They will be fine with coral but I am told that it is more work so to start with this. Apparently the light fixture that comes with this tank will support coral from what I am told although he only used live rock and never did the coral (again I have no idea about any of this so all of this is just hearsay for now). So I hear that the first thing I have to do after placing the tank is to cycle it. This is another thing that really confuses me. I see that dry rock is much cheaper than live rock and it looks like it does not have any parasites, etc. that can be damaging to the tank in it. Will the dry rock become live rock over time and what do I do with the dry rock before putting it in the tank? Is there any advice on what to do with this and how to cycle the tank as well as how to turn dry rock into live rock if it is more than just waiting for it to happen? Maybe a very short, step-by-step guide to cycling a saltwater tank for dummies, maybe including a timeline for each step? I can be patient to get the tank how I want it and am happy to put in the work if I know what to do. Also, along with the previous question about the rock, do I need live sand or dry sand, what type and how much? I guess some of the fish that we are interested in burrow in the sand.
Anyway, please help answer the above questions if you have any advice. Like I said, I know next to nothing about this. Thank you in advance for your help and I am sure that after I have done this I will be coming back for more help as well.

