Joined Gym, How to Count?

I have joined the gym and am confused now how to count my calories. I don't want to get big but ripped.

I am assuming my intake should be more but with MFP I need to enter a goal weight and have no idea. Can someone point me in the direction to figure this all out? OR i guess the question is, if I am lifting weights now how many calories do I know I have burned?

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