Before buying equipment and such, you should decide what type of planted tank you want. With more lighting comes more plant choices, but also its more expensive and more work. Do you want more of a low light tank or do you want more like a medium light tank that isn't a ton of work, but you have alot of plant choices?
Also, you should think about what kind of budget (if any) you have, since lighting and substrate (if you want plant specific) can be expensive depending on which route you take.
Here is an article to read about planted tanks:
http://www.fishforums.com/forum/aqua...nted-tank.html.