Adwords?

Hey guys, I've just started using Adwords recently for a few of my clients & I was wondering if anyone knows any tricks to becoming a re-seller fast. Or if there's any tricks or tips to get more credit for your money, like promotional codes? I'm spending between $400-$1000 per month on Adwords for each of these clients.

There is promotion for new accounts only. Search the forum.

p.s.
How they trust you with their money, when clearly, you are no AdWords competent?