An SWR meter? Those make you stupid! The school ham club, W0EEE, probably has a meter you could use. They have meetings on Thursdays.
Is this going to be a mobile setup? Check out http://k0bg.com. He's a ham, but he has a lot of good information that would apply to a cb antenna system as well. In particular the parts about positioning the antenna so that it has a proper counterpoise are important.
The best cb antenna are the $20 108" whips. They sell them at Radio Shack. Don't use springs from radioshack though. They are rust POS.
_________________ Term, holidays, term, holidays, till we leave school, and then work, work, work till we die. -- C.S. Lewis
Welcome to my area of expertise. We (The W0EEE club) have a few. One is too large for comfort but we have a real nice bird wattmeter that can measure reflected power, which is all you need for tuning antennas. Pm me and I'll hook you up.