forplay before sex is always a great way to relax and loosen up a bit. have him go down on you first and kiss and suck on your clit and finger you and get his toungue in there really good. then have him slowly insert his penis into our vagina for the very first penitration. have him go all the way in the first time, and if it starts to hurt, have him stop, but not go out. have him sit there until you feel the pain going away, then have him start going in deeper.
hope this helped
you can finger youself beforhand or get him to make shore his fingers are lubed up start with one finger then when that stops herting go to two fingers then go to three and then he can start to insert his penis but remember take it slow and try to relax and make shore he is the right person for u becase if it is your first time u wont forget it
i hope that this helps and have fun