Ok.. from experience all my shooting seems to be like an advertisement. First of all I like to watch advertisment. When I watch TV I watch ads more than movies. Get lots of foreign one and look for the best ad.
First you need a plot. Something that catch attention. Understand the purpose of the ad. Is it for awareness? brand support? Just get the objective of the ad and plot accoding the objective (I ve seen a foreign ad with semi-nude standing there for 2-3 min and the last they are selling insurance).
Then understand they camera movement, the pan,zoom etc-etc. understand the lighting too. (fill lights and the stuffs).
Then shoot your subject. Get a few good takes before wrapping up. Suggested you have 2 or more camera running at the same time so you can choose the right angle. (Cost of location and cost of talents are cast are expensive)
The it goes to post production. Do not use fancy effect. It makes your film look cheap. The effect that are normally used are fade-in/out and dissolve only. Try fast cut when you want to create suspense.
Its hard to tell you all here. Hehe. I learned that for almost a year. For a begining go to the bookshop or library on how to shot and ad. Reading is good. then watch advertisent like me. I still like ads alot. Eh.. that why I am in the A&P line. Then try to imitate some good ones. then you will proceed from there. Good luck friend.