What are my options for buying a new camera for filming?

I am a entry level guy trying to gain ground in the film industry. About a month ago I bought my first camera the Nikon D3100. Its a good camera but I wish I had done more research before buying. The limits on the camera are a bit discouraging in my opinion. Shooting at a mere 30fps, not external mic input, and the noise it makes when filming because of the Auto-Focus, im pretty much preparing myself to get a new camera. But I have to make the most of what i have for right now. I was going to buy a lens for it but now im not so sure i should. So what should i do? Should I get a better DSLR camera? Or should i save up for a Professional grade camcorder? Thanks in advance guys

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