How do you create a PDF which others can type text in to?

Try Bullets and Forms, then export to interactive pdf

It's relatively easy to produce interactive forms with InDesign CS6/CC and complete them in Acrobat. The forms can include text boxes, radio buttons, tick boxes, drop down menus and so on. It's important to know how to save the form in Acrobat for distribution so that users can save the data once they've entered it. Lynda.com has some useful tutorials, for example: http://www.lynda.com/InDesign-tutorials/InDesign-CC-Interactive-Document-Fundamentals/1290 05-2.html?srchtrk=index:1%0Alinktypeid:2%0Aq:Indesign%0Apage:1%0As:relevance%0Asa:true%0Ap roducttypeid:2

It's also useful to learn how to Replace an InDesign page in Acrobat when you want to update a form. I also suggest you make duplicates of your InDesign forms as once you have converted the form in Acrobat for distribution you can't change it at that stage.

I suggest you produce some short practice forms before you commit yourself to the real thing so you can see what can and can't be done.

Derek

I think I may have made a mistake with the above link.

Try this link http://www.lynda.com/InDesign-tutorials/InDesign-CS6-Interactive-Documents/97963-2.html

+1 for Lynda.com.

This link will get you a one week free trial: http://bit.ly/RS0GXs