Depends on your speakers. If you have screws on the speakers it's easy to just connect with just the wire or you can use spade connectors. If you have connector terminals like the pg rsd's then you will need to purchase some speaker quick disconnects
You can get them at your local Radio Shack, or the electronics section of Home Depot and Lowes. Speakers usually use two different sizes, for the positive and negative. I can't remember right now, I'm thinking 1/4" and 3/16", but I could be wrong. You'll also need to pick up a crimper while you're there.