Most people start with a compact 9mm, like a Glock 19 or a Sig P365. The P365 and its clones are huge right now because they give you 10+ rounds in a package that basically disappears. Holster-wise, you need an Appendix Carry (AIWB) holster from a company like Tenicor or T-Rex Arms. It sounds uncomfortable but they carry small guns like the P365 best, are super fast, and you can't beat the concealment....just practice your draw and forget about the tacticool junk