my advice would be to remove that ad from on top of your header and place it somewhere that it would blend in.
Don't start MFA blogs dear. It will die down anytime. Try to make a good blog with quality content then use Adsense.
Start new blog and go for social media and social book marking and forum which can attract more visitors in short time ..
This is good to learn but if you are going to do some thing seriously than get your own domain name and hosting.