Welcome Mike
Haven't been around for a couple of days, usually busier around here than it looks like it's been the last few days. Anyway, good way to start imo is to browse some of the threads here as far as tank combinations, compatible fish, etc. Or ask about a specific species you're thinking of adding.
As far as sources for fish, I haven't gotten any fish from livefishdirect.com but I've seen a couple of good reviews. You might also consider some of the sponsors here on the forum, who could also help as far as suggestions for stocking your tank.