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You are a classic "Ectomorph" body type, which means you have a raging metabolism which makes it extremely hard to put on weight. Like the guy said before me, if you are serious about this, you have to both eat A LOT (5000 calories), and rip it up at the gym. This will be as hard as someone extremely overweight (due to the opposite problem; a slow metabolism), so it will take extreme dedication and hard work.
I suggest a weight gain powder, which will make it much easier to reach 5000 calories a day
Good luck!
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I would suggest the weight gainers shakes also. Very high cal and carb without the fat. Probably the easiest way. Try your favorite online shopping place such as shopping.com or whatever and type in weight gainers or mass builder see what you come up with.