Have you had any training? Worked through any tutorials?
You have produced two disconnected surfaces and then extruded a third one through those two, producing a third surface. I think that you want a single solid, correct?
I don't have 2012 installed at home, so I can't produce a model for you. But you want to fix your first sketch first- it's not fully constrained (constrain it to the origin point), and the center line is actually two lines which are construction type. Change it to one normal (non-construction) centerline type line. With a centerline-type line, dimensions to other features are taken as diameters rather than radii.
Now your second sketch needs to be incorporated into the first one-- I don't see any benefit to making it a separate feature. When you revolve that sketch you should get a solid model rather than a surface model.
Now for the slot-- again, the profile needs to be closed, and it should cut the slot exactly as you wish.
JD Mather has a very good basic skills white paper available. I don't have the link saved at home, but a quick browse through his responses to various problems should turn up the link.
