Battledome Help??

Ok I am poor so keep that in mind :P

I have never been in a fight at the battledome, and I need guides and tips to know how to play in the battledome?

So tell me where and how I fight the weakest person, and what stuff I should get?

SO any tips on the battledome would be GREATLY appreciated!

The weakest would be Inflatable Bathlazar. It doesn't take much to defeat him.