Convert Submission Form on website from Frontpage

Hello, I have a simple seven or eight field form that I designed in Frontpage that is mission critical to our website. It only has about four required fields, and no backend datase (it just sends out an email to our general sales mailbox). I do not know how to actually code - and no idea how to go about converting this form to PHP/whatever language it needs to be in. We are moving this over to a Linux platform in anticipation of a full redesign. I can provide an FTP login to our new, blank Linux web space to test this after completed. Thanks!