I want to know what is earning more money on websites than AdSense ads and get some proof of earnings.

I am looking for some good ideas for a the subject matter of a blog that will make substantial money from Google AdSense? What are the topics of the most successful blogs using Google AdSense?

I am buying a template for my web designer to edit and complete for me but she asked me if I will give her access to my FTP server. I thought she could just do it and publish it. What else do I need and is it safe for her to have access?