I love to exercise. How often is recommended?
It is recommended to get 150 minutes of moderate exercise a week or 75 minutes of intense exercise. 
What kind of exercises are good?
Weight training is great!  It is training for developing size and strength of skeletal muscles!
Cool, how about nutrition?
Nutrition is very important to good health.  Not just strength, but also immune system.
Is sleep important too?
Big time. Especially REM sleep.  REM is known as the restorative part of our sleep cycle.