Interested in becoming designer

I personally don't own a vbulletin message board but I've been approached a few times by some people asking can I create one for them.

I work easily with photoshop and a few other programs that has 3d elements for the last few years so that's not an issue for me. But I have absolutely no clue where to start in creating a template/style for vbulletin.

Is there anything I can do or find that will allow me to enter into the world or Vb-style/template design and coding?

The reason I asked here is because , obviously, this is one of the best spots to get either an answer or pointers into this new world I want to try.

Thanx to those that honestly answer.