Get into a gym class to get started. If you want to be a gymnast you'll want to do as much as you can each day to make it easier to learn the skills presented in class. I'll give you a short list of what you can do on your own. If you work from the list each day, and look forward to that work because it will make it easier to learn, you'll surprise people with what you can learn.
Flexibility........work on the stretching exercises that come at the beginning of each class. Spend at least 20 minutes on them each day that you choose to do them, and try to do them at least 3 days each week. Flexibility takes time, so give yourself about a month before expecting a noticeable improvement.
Strength........Pretty much the advice is to approach it the same way I've described flexibility, but if you're really working a muscle hard on Monday you should rest it on Tuesday.....so no back to back strength days on the same muscle.
Nutrition.......Build up some enthusiasm for heathy foods by reading up about nutrition. and putting what you've read to use. Keep things moderate.....no extreme diets that pack tons of protien in favor of carbs or fat. Your body has a sensible use for a moderate numer of calories from each of those 3 categories. You can adjust to increase your protien, but not by more than a tuna sandwich replacing a serving of ice cream or potato chips.....
Sleep...........get at least 9 hours of sleep each night.
Do these things as much as you enjoy doing them. If you feel good about doing them just because you want to be healthier, that's great, as is enjoying them because they'll give you a better time at gym about 3 months down the road......and it will take about that amount of time to build your body up, so be patient.
Skills at home are a big no-no. Let your coaches work with you on the skills, but it's fine if they want you to work on something basic at home that doesn't involve flight or losing your ability to know where your body's going.
