cutting hole with router
I need to cut a 5" hole a 4" hole and a rectangle hole 4-1/2" x 1" in 1/2" birch plywood.
My overall shape is 15-1/2" x 6". I have to repeat this over and over so I want to make a template and was told by a guy at the hardware shop that I should use a router to make these cuts. So is there anyone out there that could tell me how to make a template and what bits to use and the best method to do this. I have a drawing that I could email of the layout. I would greatly appreciate the help for I am in desperate need to get this ball rolling. I have made many attempts on my own and have failed.