Edit Fields Within a PDF

I'm trying to develop a help wanted ad, which can be used by several of our franchises. Would like to know how I can make certain fields within the add able to be edited such as location address and phone number and have it in a PDF format so the format can not be changed or altered. Can someone step me through the process?

So you want an editable PDF file?
If I understand you correctly, you need to get Acrobat 6 which lets you create fields for inputting text while leaving the rest of the form uneditable (unless the person filling it in has Acrobat Pro as well).
There may be other stuff that does this as well but I use Acrobat 6 Pro.
I create the basic form layout in Indesign then export to PDF. Open the PDF in Acrobat and create my form fields. I think you can lock it so no-one else can edit it too, but I'm not 100% sure about that.