For saddle height, you should be able to keep your pelvis absolutely still and level while pedaling...no rocking side-to-side in order to reach the bottom of your pedal stroke. You can check this fairly accurately by setting your bike up in a stationary trainer (or have someone strong hold you up while you are on the bike), place your heels on your pedals and pedal backwards. If you can do this without rocking or straining to reach at the bottom of the stroke, you are pretty close to your correct saddle height. This got me pretty close, then I adjusted down a little for what was comfortable and called it good.
SprocketGirl's picture is perfect for getting the correct fore-to-aft saddle position. Basically, the point directly behind your knee cap should be directly over the center of your pedal axle when you are at the 9 o'clock pedal position.