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Well since it is quite a bit of weight to put on I'd advise visiting your doctor and constructing a plan with him.
Like Sage said eating McDonalds and junk may help you gain weight but it'll be the icky kind...that jiggles....a lot. Focus on consuming calories. 1500 calories per day is about *average*. So you'd be looking at getting more then that. Excersise is important too. Muscle does weigh more then fat. When lifting weights do fewer repetitions with a higher amount of weight to get bulkier muscles. More repetitions with a lighter weight gives long lean muscles.
One way to tell if you have a high metabolism is your body warmth, especially after a meal. My boyfriend is super hot after he eats (well, he's super hot anyways ehehehe). It has to do with your body converting energy. Those with a high metabolism convert energy from food into heat right away, whereas slower metabolisms store and stuff. (Yea I really need to start studying my Biology again).
Best of luck man.
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