First off, make absolute certain আপনি are ready. Cinders has an absolutely amazing article:
link Make sure he knows how inexperienced আপনি are. Make sure আপনি have the necessary precautions and have talked over with আপনি boyfriend what would happen if আপনি got pregnant/an std. Make certain আপনি want to do this for the right reasons, not because he's making you, অথবা because আপনি feel আপনি need to.
Also, make sure it's not illegal for you. Age of consent laws differ from place to place, so make sure আপনি know them and that, দ্বারা doing this, you're not breaking them.
Besides that, there's not a whole lot anyone can tell you. Most women say it hurts, so be prepared for that. They also say they bleed, so again, keep that in mind. You're body knows what to do. Relax and enjoy it.
Always use a condom!