Need some advice!

I'm a 24 yo chubby guy, mostly shy and I don't have any gay friends. The thing is that I want to have my first gay experience (never date a guy before) and I am considering to date some random guys from forums or something like that but they seem to have a lot of experience so it scares me. How do I go through this? Should I wait to meet some guy when I have the courage to ask or just go for this random guys? P.S: sorry if bad English grammar