I would start out with some leathers (Sarcophyton, Sinularia, Nepthea), cheap Mushrooms (Discosoma, Rhodactis, Ricordea), cheap Zoanthids/Palythoas, Clavularia, Xenia, and/or GSP (Pachyclavularia/Briareum).
Once you’ve got some of those going and stable, try some lps like Duncans (Duncanopsammia), Euphylias (Hammers, Torches, Frogspawn), Favia, Blastomussa, or Micromussa/Acans.
Then once you get some LPS stable and growing, try some of the easier SPS (assuming you’ve got appropriate lighting) like Montipora (Capricornis and Digitata), Pavona, Birdsnest (Seriatopora), or Stylophora.
I wouldn’t worry too much about corals like GSP or Xenia taking over your tank. So long as you place them appropriately and prune them back as necessary, they’re not a problem. I think they’re both pretty and there’s no reason not to keep them, they’re not going to take over your tank over night.
You need to take placement into consideration for all corals, not just for lighting and flow, but you need to make sure they have room to grow and also that they won’t touch other corals (some can touch, a lot of soft corals don’t mind touching other softies, but most stony corals, and especially LPS will sting and kill other corals).
As far as feeding your corals, for the most
part, the corals we keep are all photosynthetic and derive most of their nutrients from the zooxanthellae living in their tissues. They also absorb nutrients from the water column (nitrate and phosphates). Most corals will also eat things out of the water column, but it’s not absolutely necessary to feed them. Bigger LPS corals can be spot fed mysis shrimp or sometimes larger shrimp/fish, but everything else you can just broadcast feed with some prepared coral food and/or oyster eggs.
Just take it slow, do tons of research, and ask questions, check out books from the library (but keep in mind, things change really fast in this hobby, so buy the time something is published it might already be out of date or inaccurate). But I think learning from other reefers what works for them is the most direct route to success in this hobby.
Also make sure to acclimate corals to your light (start on the sand bed and slowly move them up, unless you know that they were under lighting that was more intense than yours), but once you’ve acclimated them, either mount them or set them where you want them, and then try to leave them alone. Corals like stability, they don’t like being constantly moved (for the most part they’ve evolved to grow in one place and stay there their entire lives).
