I have created quite a few eCommerce sites with WordPress and feel confident I can assist you with your request. Things I need to know so that I can best assist you:
1. Are you using any plugins to insert your products?
2. What payment gateway are you using?
3. Are you using a custom theme or a pre-packaged one? If pre-packaged, which one?
These questions will help me have a better idea of how quickly I can turn your project around and if I need to install any other plugins or do any other work in your theme to make your slideshow and payment options work correctly.
My biggest strength (other than my fabulous WordPress skills) is the level of communication I maintain with any client. I will keep you in the loop for everything I do. I've added proposed milestones, but my goal is to troubleshoot the things that are going wrong on the site now, determine the best way to fix them, communicate to you what I found and what I plan to do, then execute that plan.
I look forward to helping you get your site up and running quickly!
God Bless,
Marceia