Please help

I’m planning to start using menstrual cups my next cycle just for the fact I only hear good things about them and since I had my son I’ve been so sensitive to pads and tampons. What are some tips for a newbie; how to put it in, how to take it out, how to pee with it in, when to take it out, how to clean in at home, how to clean it in public, how to go #2 with it, can you sleep with it, can you swim with it, what’s the best one to buy, how to know what size to buy??????