These are probably things that you've heard before...but you may not have.
1.) Cool Down: These are included in all my workouts. A cool down means continuing to move around for at least 5 minutes after a workout. It helps remove lactic acid from your muscles and prevent soreness.
2.) Hydrating: You should be drinking at least 8 cups of water...when you workout, even more! Water helps you before, during, and after a workout. The second you feel thirsty...you're already slightly dehydrated. Especially down here in Texas! 100 degrees today! yay!
The main things that dehydrate you: Alcohol, Caffeine, Heat, and Exercise
For other things that dehydrate you:
http://www.healthy-water-best-filters.com/causes-of-dehydration.html
3.) Rest/Sleep: You should be getting a good night's sleep and taking days off. It helps to workout in the morning, so you are tired at night. If you work out at night, it can make it harder to get to bed.
4.) Snacks: Snacks before your workout are good and may give you energy. Personally, I can't because it will often make me vomit. The move important snack is after your workout. It helps muscle recovery if you feed your body around 200 calories no more than 30 mins after your workout.
Here's an article about good after workout snacks:
http://www.fitnessmagazine.com/recipes/snacks/low-calorie/after-workout-snacks/