Product Upload Opencart

I am creating a new site and need products to be uploaded (some of the products are on another site I own so if you can transfer them from there instead of doing it manually then you can do that as well - that site is on Shopify). This will be an ongoing project with a bulk of the work being done in the next 2 weeks or so and the rest on an as needed basis as we acquire new relationships with manufacturers. Here is what I need: 1) Someone who has experience uploading to Opencart - must know the software and how it works. 2) Experience with product upload including modifying descriptions so that they are not duplicates from manufacturers sites, meta description and title tag must be written with SEO in mind 3) I will provide you the manufacturer URL's I need the products added for - and you will need to get the images and descriptions and upload them to the site - modifying the description so they are different from the manufacturer description - ENGLISH must be excellent for this project. 4) If multiple product images exist, the should all be uploaded. Prefer images to be renamed to be SEO friendly as well (example [login to view URL])....images are to be put into manufacturer specific folders in Opencart 5) Addition of options as needed (small, large, colors etc) 6) You can use retail pricing from manufacturers site, I will adjust those at a later date I am expecting about 500 products in the short term and again am looking for someone I can go to frequently for site updates. I am guessing an hourly rate would be best for this. So please quote based on the hours you think uploading 500 products would take. (Again, about 100 of these items are on a Shopify site I own that I will be closing down - so if you can migrate those instead of manual upload - you can do that too!).