thinking about doing shrooms

i wanna try shrooms with my friends soon and idk what to expect im 15m and i smoke weed pretty regularly but idk what to expect with shrooms so i just had a few questions

-how many should i eat?

-how often is a bad trip?

-how long does it take to kick in and how long does it last

-is their anything i can do to make the trip better or more enjoyable?