Like everyone said there are many opinions on here, so take what you can from everyone, and then decide whats best for your situation. and lastly, the best way to learn is by doing
I would throw an alternate opinion out there and suggest something a little bigger, like a 75g, for a first tank. Its easier to get and keep everything stable, and the bigger a tank, the more forgiving it is to mistakes. Whatever size you go, if you are planning to go bigger eventually, Id get a reef-ready tank with an overflow and do a sump. At least for me, the plumbing was daunting at first, but once I did it, I realized it is very easy. But I wouldnt have been able to do the planning for my 225, if I hadnt learned by plumbing the sump in my 125. Just my two cents. Welcome to a very addicting hobby.