Simply go ahead and edit a profile and where it says "Java Settings (Advanced)", tick all the check boxes. Then add the amount of RAM you would like to the JVM.
Try to create your own unique object, constantly cross different things to get something interesting, enjoy the colorful scenery of the world, which will.
The models are pretty simple, and so does the animation, which can probably be made without rigging. The lighting can be tricky to nail down, and the texture.