Hello everyone I just recently became interested in fish keeping and am a bit overwhelmed about all the information out there about setting up an aquarium and taking care of a Betta but I'm quickly learning, or at least i'd like to think that. Anyway I got about a 27 gallon tank (18Hx12Wx30L)from a friend the otherday and am trying to figure out where to begin, I'm thinking of getting some sand to use as a substrate then setting up the aquarium for about a week before adding anyfish. what I want to know is, is that the right way to go about this? and is a 27 gallon tank too much for a beginer?
I think once I get started things will become more clear but I'd like to avoid some rookie mistakes if possible

Thanks in advance