Website alterations and maintenance

I have an OS Commerce website selling beauty/skin care products. It is up and running but has a few glitches which need sorting out at the back end and I would like to change/add some content.

Jobs include:

Paid orders are currently ending up in the wrong section (held orders not awaiting posting) - this needs fixing
Contact form/emails not working properly
Updating shipping modules
Changing/adding product photos and listing new products

I am looking for someone with excellent English who is honest and reliable. Must be fluent with osCommerce and easily contactable. Please include your hourly rate in your reply.