Babushka! Where do we start - you are seller+ so you've paid to have up to 5 stores so put your stuff in stores (makes browsing and thus multiple item sales easier). Your items will be automatically uploaded to google shopping so long as they are bin (which most of yours are) and have both the barcode & the manufacturer fields completed.
other stuff...
http://www.mootango.webspace.virginmedia.com/ebidkb.htm
if you need to know anything else, ask (on selling board or pm me)