sigma zoom lens

The Sigma lens is a 28-70mm 1:3.5-4.5 , and I'm assuming that I can use this with my 350D. I'm getting impatient with the struggle to find a cheap lens, so I put a bid on this on Ebay, and I've won. Now for some questions, as I don't want the 1000F. The camera was listed as untested, and I was...