I'm a 27 male and interested in first bi experience?

I'm 27 and have been propositioned by my a friend and clmate about experimenting with them. The both have asked me in private if i ever wanted to experiments they would like to. im not sure what to do. Ive never done anything like this and have only really fantasized about trannies. but both are fem gays so idk looking for advice and frinedship thanks