You should be able to search the net for exercise descriptions. Try
www.exrx.net or search on this forum for some links to video exercise demos.
Energy system training would include your HIIT sessions. Think non-strength training exercise.
Key ingredients in your eating program:
1. Adequate calories
2. Adequate frequency
3. Adequate protein
4. Adequate health fats
5. Eat real food
6. Eat enough carbs to restore energy after workouts.
Bill