Help

This is sort of a random blog, and if I'm honest, I partially just made it because I was bored. But I really do need help. With various things.

1. How do you change the color of the headers?
2. How do you change the font color of the blog title?
3. How do you change the background to a picture?

I'll probably have more questions eventually, but these are kind of my top priorities right now.
If you decide to be generous and do help, thank you so much! My page looks so boring at the moment.

-HarryPotterGeek, who hopes that someone will help