A friend and I are planning to make gaming videos but we don't really know where to start. So do any of you forumites have any advice regarding capture cards, headsets or anything that could help us?

For someone who is just starting out, a Dazzle is a good choice of capture card. The video quality isn't as good as a more expensive capture card, but they're fairly cheap and easy to use.

Any certain types you'd recommend?

What about headsets?

Are there any other things I need?

It depends on what your budget is. If you can, get the http://www.newegg.com/Product/Product.aspx?Item=N82E16815116030 or the http://www.blackmagic-design.com/products/intensity/.

And concerning headsets, any good gaming headset will do.