How to use testcomplete in Agile

Hi

I am new to testcomplete.I have started to use it with functional testing for deskstop application.

But I want ot use it in Agile project.

Also I want o use it to generate test script before develoment started. I am not sure How I can access the object before develepoment of the project?

your help will be appreciated.

Thanks

Darshana