The basic loop is easy to do, just pull up. It is hard to make a perfect loop, decrease throttle at the top and try to make a perfect circle.
Try flying inverted. Remember down is up when you are inverted. I like to practice flying inverted circuits.
Rolls, remember down is up when you are inverted.

Practice as high as you can clearly see the plane. Five feet off the ground is cool and impresses people, but five hundred feet off the ground the basics are the same and you can make 5 or 6 mistakes and still fly tomorrow.

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Oh, hammerheads or stall turns are fun and pretty. Go straight up until you run out of power. Kick the plane over to the side with the rudder then come straight back down. When you come down far enough use a little up elevator to return to level flight.

Reduce throttle to idle on maneuvers where you are coming straight down or diving. Gravity brings you down fast enough. There is no need to use the motor to try and remove the wings from the airplane.

For more ideas http://www.3drc.info