you don't even need bdus... just wear whatever if you're running skirms.
something to carry mags
something to carry water
Do your gear shopping at games lol. See what other people are wearing and see if that kind of setup would suit you. Find some cheap stuff to mess around with to see if you like running it before investing in expensive real stuff.
I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.