@MacCali - I hope you are taking many of the responses with a grain of salt. It sometimes pains me to see how people like saying just the most random crap to newbies and dragging them through the mud instead of actually helping them. For some reason, they think that being uninformed is a good time to pull out their knowledge and treat others like stupid morons instead of getting them up to speed.
At the end of the day, if you got a good price on basic 12 or 14 gauge speaker cables, then that's fine.
You do want to KNOW the gauge (thickness) of the cables you are going to be using. The cable thickness combined with the length of the cable and the impedance of the speaker all matter for best sound quality.
The best links you got were the first few responses which just gave you real information on length/gauge/resistance.
At the end of the day, you should not be afraid of low-voltage (speaker) wiring. There are dozens, if not hundreds, of videos on YouTube about how to properly terminate your own speaker wires to banana plugs. But, you do want a decent wire stripper, which may be $15. It's a good skill to have.
I'm one of those people that often recommend in-wall rated (CL2/CL3) speaker cable for all speaker wiring as I like the cables to be bundled. But, what you get is entirely up to you. Banana plugs, speaker cable, etc. Terminate it yourself, or not, or whatever. You don't even need to terminate it at all. Just run the wire into your speakers. Whatever works for you.
Just realize that 50' of 12AWG speaker cable runs under 30 bucks. 100 feet is about 40 bucks. 4 pairs of banana plugs runs about 10 or 11 bucks.
So, all in, you are at about 50 bucks for 66' of 12AWG cable, terminated if you DiY. Spending less than that for 12AWG is a good deal. Spending a bit more for someone else to do it isn't a big deal. May even be completely worthwhile. Spending twice as much is a waste. It would be much better for you to learn to DiY and gain some knowledge rather than buy your answer. But, that's only if you are in a situation where you are spending much more than 50 bucks.
Please don't get discouraged by those who shoot out their sarcasm all the time in an attempt to lighten the mood, but really are just taking aim at the newbie. Some people just can't seem to avoid it.