OK, you want to increase protein intake, and make sure you are eating right. Bodybuilding websites have great articles on how to eat correctly. You will need to train, a saying you should remember: "train like a kid/girl/weakling/etc. look like a kid/girl/weakling/etc."
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But seriously, I would say, eat well, and exercise as much as possible without overtraining. If you have extra body fat, you can train to convert this to muscle, but if you are already quite thin/lean, you will want to eat enough to keep you body going, and then more (bulking); during bulking you put on fat, which is converted to muscle. This is mainly a competition thing for bodybuilding, however, you will need to do it to gain muscle.
Just read up on it, read articles, and other information, and you should do well.
Edit: I have to say, that during bulking you aim to gain
weight not fat, I made a mistake, however, I know that people do gain fat during bulking. I am very sorry for the error. Basically, to rephrase me thoughts, I would say that to bulk you will need to consume more calories than at other times, and this will make your
weight increase. I am awfully sorry about the error. Or am I missing the point/idea of bulking? (I have never done it myself, or read about it really).
Angus Higgins
Or is there any other useful workouts you can do to gain muscle
