How do I get bigger arms?

I am a 17 year old male, and I'm tall and pretty skinny and I am trying to get bigger arms... I've been doing push ups and sit ups for like the past month, they've helped my abs but haven't really strengthened my arms alot. I'll probably be joining the gym next week sometime, so I was just wondering what food I should eat and what weights and stuff I should do to get bigger arms? can anyone help?

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If you are going to the gym consider having a couple of sessions with a personal trainer who will put you on a long term weights plan. They can be pricey but are so worth it...if you dont know where to start they will put you on the right track. good luck!