if you are going to start exercising, you definitely should eat more than you're eating now, especially if you don't gain weight eating how much ever you've been eating.
a 40/40/20 plan is good in my opinion. that's what i do. to give you an idea, on my workout day's i eat at least 3000 calories on a 40/40/20 split. i'm 5'7", 160. so that's about 19 calories per lb, and that's just to maintain.
i don't know how many calories you eat right now. the only way to find out is to track it for a few days. i use fitday.com. if you're unsure of certain things, you could get a food scale, it's helped me immensely in counting calories.
after you find out how many calrories/day you are currently eating, just make sure to eat more than that to cover anything you burn during your workouts, because it sounds like you're not too worried about weight gain, and you're pretty skinny as it is. the mere act of doing exercise will probably help you lose some fat, or at least gain some muscle if you do some weight training.
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