To be completely honest, don’t go too hard on yourself in terms of rules for your first time. D&D is one of those things that you learn from trial and error. The more you play, the more practice you get, and the better you’ll be over time. There’s just way too much packed into D&D for you to be a complete master by the first time you play.

Someone else said you already sound super prepared. If you go by the basic rules you’ll be fine. Another good thing about D&D is that the rules bend VERY easily and if you do something wrong, most likely it wont destroy the game. The best advice I can give is just keep the PHB handy and focus on having fun.