Handwritten Signatures

We use Adobe 9 Professional and are trying to create our handwritten signatures so we can sign pdf documents.  I have step 1 done (scan your signatures in a relatively high DPL); where is step 2 located (covert the image to a vector drawing).  Is this available thru Adobe 9 Professional? or is it a separate application that needs to be purchased or downloaded.  Once we figure out step 2 - where is step 3 (make the background transparent) located?  Thank you.