Start with two 15amp breakers,first breaker runs to a junction box off that the wire runs to gfci outlet and then to the other outlets.now my compressor puts out 15.0/7.5amps and the light fixture is a two bulbs at 40watts.now would I be able to run light and compressor on the same breaker.I will be using your do-it-yourself power tools like drill,miter saw,etc,and if I hardwire something in do I need a junction box.

Sounds like a shop of some sort. I would DEFINITELY go with 20A circuits instead of 15.
In fact, if your compressor DRAWS 15 amps @ 120v you will NEED a 20A circuit for that alone.

Is the wiring run already?