This is a familiar thread for me, since my goal for this year was to learn to fly well inverted.

The easiest way to get inverted is to roll. You may have to stick the nose up a little before rolling if you don't want to lose too much altitude if your plane rolls slowly. Be ready to apply a little down elevator as soon as you finish the roll (it should be just a little pressure on the stick, hardly any movement). Do one thing at a time: A little up elevator to raise the nose, let go. Hold the aileron to roll, then let go. A little down elevator to fly level inverted. If you panic, ROLL, don't try any other manuever to get out.

When you have level flight inverted, you'll see that the ailerons do the same thing as they do upright, just the elevator is backwards. Now, try a turn. Bank the plane, add a little more down elevator. Level the wing. Yeah! Roll out and rest! Try a figure 8. Low passes are pretty easy.

A good flyer told me it would take "4 planes" to learn inverted flying. I'm really only on my second, but if you have access to a simulator, you can really save a lot of balsa. Think about building a SPAD!