First Time Commish Seeking Advice

Hello all, I'm a first time commissioner of a brand new fantasy hockey league. I managed to get 7 of my friends into a league together this season, which is less than I hoped for, but was the bare minimum I would start a league with. I set it up as a H2H Each Category style league. I'm looking for advice on roster size, categories to choose, and anything else that might be noteworthy for a first time commissioner to take under advisement. I'm sorry to be the clueless new guy here asking for advice so please be nice with your comments lol. I'm genuinely looking for helpful advice, suggestions, lessons learned, and all that.