Well my hair is light golden brown and I want strawberry blonde but I'm scared to do it because I don't know if I will work because of my hair color. Do I bleach it before? Or what?

You do a test on a large enough "patch" of hair to be able to tell if the dye takes or not, what the color will be. Usually the nape of the neck is a place to start.

Or you could have a hairdresser do the work.