Want to make a banner and a layout?

Hey, guys! I've been working on a new story and I want to post it as soon as I have it done, but I don't really know how to make good banners and layouts. I know there are very talented people here on Mibba, so if you're one of them and if you are interested in helping me out, I'd be more than thankful. I don't know how this works, but whatever information you may need I can give it to you. Oh, and I will credit whoever helps me when I post the story. I'm not hard to please, I promise ahaha
So yeah. That's it. Anyone? Please?