The prac doc you must read lightly - ignore the 777 and 755 references. That is server side, and not a concern for you now. Just read the parts that makes sense for you
We want you to dsiplay a couple of products, that's all.
The ProceTag option has bombed on us, so strictly speaking I want to go to you shop, view some products, decide which I want to pay and proceed all the way up to paying (PriceTag, which is not working now
Ignore the cache. Once agin, figure out how to create categories (i.e. Sound Sytems) then products within that category (e.g. Phillips, Bose, Telefunken).
The rest is what one could call "personalization" - making the shop yours.