Recovery and rest are a more important part of going from skinny to muscular than many people might think.
With the emphasis on workouts, weight lifting and diet how and when you rest is often completely forgotten which is odd because it is when you are in recovery mode that your muscle actually grow not when you lift the weight themselves.
The reason for this is that when you are at the gym lifting weights you create small tears in the muscle tissue as you push yourself to lift heavy weights.
These small tears then need to be healed of course and since your body really hated the pain and effort you put it through it adapts by overcompensating and building up more muscle mass over the small injuries.
This extra "scar" tissue are just more muscle that has grown making you stronger and looking stronger for it too.
The only time that the body does this is when you are at rest.
When you are asleep you also gain an extra bonus as growth hormones start being released about an hour into your slumber which aids the process even more.
If you do not get enough sleep and you go top the gym too soon after a session when your body has not had enough time to repair the muscles properly then you set yourself back so much when the alternative is better for you and your body building dreams.
As a very general rule make sure you get a full 8 hours sleep each night and go to bed earlier than perhaps you are used to if you are a night owl.
Also as a rule of thumb the more intense your workout the longer you need to rest, if you are really pushing it you actually want to spend a bit more time away form the gym but if you are training differently and are not completely drained after a session you can comfortably increase your gym frequency.