first black car? get used to seeing scratches on it.
marker is for gheys, you can use compound and remove it. Follow it up with a nice wax and you should be all set
I am a big fan of Mothers and Meguiars car products they do a really good job
Before you do any of it , try it on a small section on the bottom of your car
here is a link to the Meguiar product line
Meguiars Car Care