Christina,
The best advice I can offer is to read read and then when you think you know a lot read some more.
I recently bought a '65 - my first car that was pre 1990 with the exception of a short lived college beater.
I hung out on the NCRS boards for a while and then bought it right in Pontiac, MI.
There are about 1,000,000 things to look for so I won't go into it now.
The basics are to determine what you want in the car and what you want out of the car. By this I mean you have to assign weight to your likes (color, side exhaust, engine combo, matching numbers, etc...) and determine what you can sacrifice and what you CANT live without. The more you CANT live without the higher the price can be.
When I say you have to figure out what you want out of the car you have to determine how often you will drive it, how you will maintain and fix it, and what you expect to do with it in the future.
If you're completely new to this hobby I recommend sitting back and observing for 6 months. go to
www.ncrs.org and join. Check out
www.corvetteforum.com and there are numerous other 'vette boards. The more you read the better. Ask stupid questions and then ask more when the answers don't make sense. Read the ebay descriptions to learn some basics and put general (very general) values on cars.
http://www.ncrs.org/store/shop.cgi/page=New.Buyers.html/SID=1058221750.27907
This link is from NCRS and points to some publications you should check out before buying.
Remember, almost anything can be restored - it's the cost that matters.
Send me some e-mails if you'd like to chat more. I got burned in a few places on my first purchase and probably wasted $3000. Don't let it happen to you!
Brian