Hey There, I'm New Need A Couple Answers

[Sickan]

There are some people who have invested in a project and just have one problem that they ask a question to (in the case of this post, they weren't sure how to start a graphical game). I would advise (as I have done before) to search the forums for a similar question or google-search it, then come and post if you still have questions/issues, or if it doesn't apply to your specific situation. A lot can be learned by googling your problem  

Off Topic: Sproingie had exactly 10 times as many posts as RobinB at the time of this post XD

Not to mention how much time you save if you don't have to write a forum post and explain your problem in detail to others, and then wait for their replies; compared to just looking up your issue online (even if you need to spend 10 minutes).

[Jimmt]

If you want to make a tower defence game, you shoud use slick2d. It is easy to learn, and has some very powerfull features.

PeterNicholson uses suggest slick2d!
Jimmt counters with suggest ligbGDX!

http://code.google.com/p/libgdx/

[Pickleninja]

I found slick2d pretty easy with good examples on how to do graphics. My suggestion would be to try something small like "how do I move this image..." and then google it. That's my preferred method of learning.

-Pickle