You can either use a premade layout, look through the site affiliates
and find a designer who will make you a layout (some of them have premade layouts on their sites, take requests, or work with you directly for a fee), or you can work on your post count and make a request on the forums. The first two options are going to be the quickest, though.
Also, welcome to cb
You should check out the Guide
, and then if you have any questions feel free to ask.