Start of by
1. Unzipping the pants.
2. Assume the position.
3. Grab it (if it is not erect try dry humping)
4. Put it in your mouth (try covering your teeth with your lips).
5.Try not to gag.
If gaging occurs try licking the head or the balls,
6. Try manual stimulation while you are giving head.
7.Repeat steps four through seven until ejaculation.

Tips for you.
If he does not give you oral sex do not give him oral sex.
If you do not want semen in your face learn to dodge.
Use flavored condoms for protection from std's.

And you should be on your way into a satisfying bj. :d

Hold his piece in your hand. Wrap your lips around it while sliding it into your mouth. Deep throating is if you let it go in really far so it is hitting or going down your throat. Or you can just lick it all around, taking it in and out of your mouth- letting it slide slow or fast in and out of your mouth. Not all the way out. Let it come out a little then suck it in, etc. If you don't want to swallow the cum tell him to tell you when he is about to cum and you can pull it out of your mouth- most men prefer if you swallow though.