Take it to good shop. Get a regular edge tune, that will put a 1/1 bevel (99% of shop do this unless you tell them otherwise). 1/1 bevel is all your need for boxes and rails if you are just learning.
I have a tune kit including a file, edge tool, and stone. So how can I do this stuff myself?
My edge tool looks like this, but I don't know how to use it.