google shopping listing

I have a google base account and 3 websites that i want to put in google shopping (froogle) however i am stuck with the data feeds (if that is the right way on how to put them in?) -help me to put 6 products (each site 2) into google shopping -if possible make at least one of them appear on top of googles search results, in their shopping section - when you type in "buy xxxxx" (niche product) I was thinking 30-40$ for this and 5 days time as the products may need processing by google to appear. Thanks