I really need to know HOW to do this problem... and why...

He gave us an incline that is 30? with a box on top of the incline. When the M[sub]s[/sub] =0.5 and M[sub]k[/sub] = 0.3.
What happens?
-Does it move?
-If so, what's the acceleration?

So far :
I have drawn a force diagram that shows f to the left of the box, mg down from the box, and N (normal force) up from the box...

Then,
Fxnet=max and fynet=may

So,
-fk=max and N-mg=may

is any of this right?... and if not... can someone PLEASE HELP.