Convert 1 Page PDF into Electronic PDF

We are building a site that allows people to buy and sell their personal junk. This serves as a "Contract" that I would like to create electronically so they don't need to FAX it to us. PDF currently includes the following fields: Names. ______________________________, Customer, and ____________________________, Consignee, agree to the following blah blah blah.. Description of Goods Sale Price desired (min/max range) (three fields >>here would be nice feature to have a DHTML like thing where a person can add more fields if they have more items to sell) ____________________________________________________ _______________ ____________________________________________________ _______________ ____________________________________________________ _______________ CUSTOMER Name of Business: ______________ Address/City ____________________________ Phone Number (Day/Night): _____________________/____________________ By: __________________________ Dated: _______________________ Printed Name: _________________ Title: ________________________ Address: ______________________ ______________________ CONSIGNEE Name of Business: ______________ Address: ____________________________ By: __________________________ Dated: _______________________ Printed Name: _________________ Title: ________________________ Address: _____________________ (I don't personally understand what the process requires for an Electronic Signiture to be included... Your suggestion is welcome to complete our form). Thank you.