Need some advice!

I've been with this guy for a little bit ( We are both 19. I'm 3 months older lol)

We want to start having sex. I am not on birth control. What would you recommend? I'm are virgin, he isn't.

Also, how long before you start having sex in a relationship? Is 6 months a safe number? We haven't had sex yet.

Any advice or comments would be great. Thank you!