When Should I First Practice After My Lesson?
Most people make the mistake of waiting a couple of days, only to find out they've already forgotten what was discussed. One solution is to digitally record your lesson, which can be done easily from most smart phones or handheld recorders. Then you can review the lesson at any time. Most teachers have no problem with recording lessons and usually recommend it.
How Often Should I Practice?
Practice Time (daily)
30 minutes-1 hour
What Should I be Doing When I Practice?
Metronomes and tuners will always be your best friends when it comes to practicing. String players especially need to tune every time before they practice. If you're always practicing out of tune, your ear will never hear the pitches correctly. As well as developing your ear, no one has a perfect sense of rhythm without lots of practice with a metronome.
Some more sophisticated metronomes have a feature where they can play any pitch you desire. I use this feature to check my intonation. Simply set the pitch to the key of the piece and start playing. This will quickly reveal pitches that you previously thought were in tune.