By your description of your body type, I would say you are able to take in about 2500 calories a day. Now this all depends on what you are going for. if you are looking to bulk up and gain. then you are going to need to consume more calories that are based on protien and carbs. on the other hand, If...

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I am sure you have heard the whole caloric deficit before. so i wont go into that. you need to get a diet plan and exercise plan and stick to it. sounds to me like you are fairly lean already. guess is that it will not take you very long to get the results you want.