My DH particularly likes it if I'm kneeling, this makes it easier with the eye contact. Tend to do it when I'm undressing him.
He also likes his balls licked and gently sucked too.
Whilst licking in a swirly fashion around the head (as described above), try licking under the foreskin (if he has one, and only if you've just had a shower together so you know you've given it a good wash!) and pulling it back really gently.
Do little puppy licks all the way down the shaft and then up (it is now a good time for a little eye contact), do the swirly top thing for a bit again, put it in your mouth gentle sucks. Take it as far in as you can, then go back to giving the head some extra attention. Go down licking,give the balls some attention. Don't change sppeds/technique/area too often but think butterly touch, melting icecream licks (fast and firm) etc.
You could try massaging/licking the area between his balls and anus. Licking your finger and gently massaging his anus - although some men love it some may run!
Personally I think you need a little advice from the man, perhaps you caould ask if he likes whatever new technique you are trying out.
Keep a drink handy if you are nervous a dry mouth is not good.
Champagne bubbles good, as is coffee and ice cubes alternately - ice cubes also good for nipples too.
Good luck, relax and enjoy.