Don't despair if you have an ectomorphic body.
One of the things that many people find so difficult is reducing body fat in order to let their muscles show
This is not something that you will generally have to worry about. That's the hardest part in bodybuilding!
So, my advice to you is - Diet is very important when it comes to developing your physique. This is very true for an ectomorph, and people with this body type must adjust their diet in order to experience weight gain.
Try to eating the Right Mix of Foods to Gain Muscle.