[JWait]

I placed a test order on your site. It appears you have some work to do in the required fields area of register and your shipping area. Also, letting the customer either know beforehand, or changing the code to accept it, that only lowercase letters and numbers can be used in the username. I would change it so that uppercase can also be used. Then you can simply add a "statement" ("letters and numbers only") after the field on the register page.

And definitely setup your shipping options! I don't see how you can run a business without them as the customer generally wants to know the shipping cost before they will place an order. If you do not want to set it up, at the very least add a flat rate for every order or include the shipping in the price of the product.