Jeff here is a simple but very true statement. Whatever you can play with your hands you can play with your feet. You need to set a time every day and pratice, muscle memory, repetition, when you are playing the rudiments with your hands, also do them with your feet. Also the bass drum angle really matters as morello mentioned, the front rim of the bass drum with your bass drum pedal mounted to the drum should be no more than 1 1/2 to 2 1/2 inches off the ground. Don't set the spring tension on your bass drum pedal to tight. Also beginning drummers the bass drum is almost always the weak link in their playing. Here watch this video this technique called heel and toe is an advanced technique, watch it, from Steve Smith.Steve Smith Bass Drum Techniques - YouTube