i can only tell you this from my personal experience, but you'll be fine. i really only like the movies and don't watch aos or agent carter, but i've liked the netflix series, so i'm in the same boat as you. and there's no reason your character should remember all the movie characters, unless that's their job in the series somehow. the basic rule you should try to stick to is, make sure you're familiar with the chars in YOUR series you're playing from, and then anything outside of that is just an extra bonus, if you want. eg; there's no reason for luke cage to personally know any of the avengers, but he's probably seen them in passing on tv. doesn't mean he has to know or act like he's bffs with them if he plays in a game with them. just like none of the movie mcuers might know any of the show cast, because they're more low-key.

just play what you play. as long as you're ic with your character and willing to play with others, there's no reason for you to know everything about everyone. you're overthinking it. just relax. you're good, anon.