Anyone know how i can become a Advertising account executives as a career? thanks!!?

The easy things -

Research all the ad agencies in your region and call the HR department.
Check the job ads at www.adage.com.
Find out who the head hunters are who specialize in agency searched in your region and get appointments to be interviewed.

The hard, but probably better things to do:

Target a few agencies that you'd want to work on. Find out which clients they have. Find out who the group account director is who is responsible for which account. Contact those senior account people and ask for an "informational interview." Tell them you want to get into the biz and would appreciate even 15 minutes with them. When you go, make sure that you know about their agency, their clients and something about them. All you could ever want to know, you can find on the Internet using Google.

The move effort you put into it, the "luckier" you'll get. Good luck!

Have your brain removed, although I think my advice may be a little late

Marketing is a full time profession, you need to qualify at first place, like Bachelors of Business Administration or probably a few short courses to kick in as a successful accounts executive career.

Having fair understanding of marketing concepts will always help you in fetching clients, as most of the times they look for instant ideas, right on their desk, in order to give you go ahead for future business.
You always build on or improve those ideas through creative department or come up with a better one.