zen-cart design

I have a firearm website setup using Zen-Cart only. I have most of this website completed besides uploading all of my products. I need someone who has a good working knowledge of Zen-Cart to make some design changes to the appearance of the website. Also I need someone to check out the whole website to check for any code errors and make sure the whole website is functional. I use a credit card processing company called EPN to process all credit card transactions so I need someone to make sure I have this module setup correct and reporting emails, redirect url's, and anything related the correct setup of EPN module.