OP, you will find my tutorial here helpful:
http://www.blackhatworld.com/seo/tu...erate-and-semi-unique-content-in-mass.801320/
I would not even look at product level SEO unless they are top sellers. 11,000 products is quite a lot, it would take you years and it's just commercially not worth it. The only think I would do is put as much information as you can on the page, not for Google but for the buyers.
I would start on category level. You want all your products in proper categories, where customers would expect to find them. You will find also that people are much more likely to Google "55 inch TV" rather than product level keywords like "JVC LT-55C550 55" LED TV" anyway.
For categories you want the exact same shit you would have on any page, lots of good content, proper tags in proper places but the design aspect of it all is a little harder... To keep people converting you need to put the products they want in front of the customer which means to have a 3000 word article on stuff would just kill conversions as no one would scroll.
I've done a few things that worked well for me...
1. You can put between 100 and 300 words at the top above the products before it starts to feel too obstructive. The rest you can put at the bottom under the products and out the way.
2. JavaScript tabs. You want 2 tabs at the top, the default view shows a grid/list of your products as you and all customers would expect. A 2nd tab headed "information" or something like this displays your 1000+ words of content. This worked well and was my preferred method.
Here is a basic example of what I mean by tabs
http://www.w3schools.com/bootstrap/tryit.asp?filename=trybs_ref_js_tab_events2&stacked=h
You also want to get your bread crumbs right, if you can have 1000 products with links to their parent category you're building a pretty big silo there which is super easy to do for ecommerce.
What platform have you built the site on also? I wouldn't use anything but magento for a store of that size. If you are using this look at magmi, it will make importing all this so easy for you.