Three to six players refers to player characters, right? I'd like to run a game for a couple of other folks; are there suggested techniques to deal with less than ideal player count? Do some roleplaying systems work better than others for this issue?
Also, is a PBtA style campaign a good choice for a beginning GM? I can see less rules and more creativity being both easier and more difficult. I do have a pretty extensive experience listening to lots of actual play of both D&D and PBtA games, but zero experience running a game.