I was daunted by the process of conversion as well. I made the plunge with a 14 gallon biocube. It was great to start with, but as I found my wants grew, and I wanted to get into SPS. I'm a firm believer that a lot of learning is done by doing. I've tried different lights, different salts, different dosers, many different tanks. I've gone through different sumps, water heaters, automatic top offs (ATO's) RO/DI's, pumps. I've sodered LED's, I've drilled tanks, set up QT's, dosed different things, and I'm better off for all of it. I also never heard of any of these things before I just dived in and tried to research as much as possible!
I always find it wise to start with an easy cheap all in one (AIO) and figure out what you really want to do, and then dream big from there. Some of the nicest tanks I've seen are 29 gallon biocubes, so maybe you decide you don't want a big tank! You can always stock real light at first, get some nice rock, live or dry, and really take your time in getting to know the ins and outs of saltwater. Sit tight and let the cycle happen, just remember, nothing good happens fast, and welcome!