I am definitely not a teacher, so specifics I cannot truly comment on, but I do know this:
Every day before you practice be sure to eat good protein and carbs. Protein helps build muscle and carbs give you good energy to work out with that will last you a while. Eggs and wheat bread or oatmeal are great. Also make sure you end the day on a protein like chicken or lean steak. If you get a good workout in you should be sweating, so water is always necessary as well.
We really work ligaments and muscles in very different ways then the average athlete, so making sure that you are hydrated and eating pretty well helps keep you in shape and prevents injury, and its a crucial (if rather obvious) part of training, with or without a group.
Oh and be sure to stagger your workout days. You do not want to work every single day of the week, it will not give your muscles time to heal/grow if you are constantly putting them through stress, and it could end up really hurting joints (ie the wrist). Every other day is a good idea.
Hope I helped a little.