Lick his balls and the insides of his thighs but stay away from actually touching his cock. Make him squirm a little first. When you first start out take your time and use slow deliberate strokes and cover the whole length of his cock. In my experience sucking on my partners cock isn't enough to get him off, there also needs to be plenty of hand action on his cock as well as on his balls. The two work very well together.
Lubrication is a good idea.
The best lubrication I've found comes just from using your saliva. Instead of swallowing all the saliva just let it dribble down onto your hand and his cock. It keeps everything fairly well lubricated. Koi Media Ltd. No portion or part of this tutorial may be used without the express written consent of Koi Media Ltd.