Amendments made to Wix website

Hi There,

I am look for some assistance with simple amendments with to a website currently being built in Wix.

The amendments needed are as follows:

1. Add form to check out process.
2. Change layout for product pages to a sales page format.
3. Fix some links that auto-link to the wrong place (and I can't figure out how to change!)
4. Ensuring images sit correctly on home page.
5. Ensuring contact forms are set up correctly.
6. Set up eCommerce payment system correctly.
7. Add 'back' navigation where necessary for UX.
8. Attach newsletter subscription to Mail Chimp account.
9. Add SEO capability per page - plug in?

I don't anticipate this to be a huge amount of work for someone who knows what they are doing.
Please only contact me if you have PROVEN experience of working in Wix and can send examples of your Wix websites. It is important that this process is an efficient as possible, hence the need for previous Wix exerience.

Please only contact me regarding the specifics of this request and not with a 'general development' message that you send to everyone. These messages will be ignored!