Whats some good tips on going down on a guy?

Alright I know this is crazy but i was just married for the last 7 years. And the last about 4 years of our relationship th romance faded and dwindled. Now im dating someone else and I would like to please him orally. Honestly I can't remeeber what to do. I feel like a dork, I just don't want to get to it and him go...wow this chick sucks...lol. I was having trouble just with a hand job lastnight. Its been to long. Any good tip on both subjects would be great appreciated.