Cindy,
You could do well just to follow Bar Guy Brady's advice. In fact, I suggest his post should become a FAQ for anyone who wants to know a little bit more about wine.
I will however also suggest Patrick Fegan's Chicago Wine School classes. I am a graduate and have the certificate to prove it
I might also suggest that you evaluate exactly what it is that you want from a wine class. If you are looking for in-depth knowledge so that you can continue learning through out the process, then by all means look to CWS, CHIC, Kendall or various other programs associated with professional culinary school programs.
You can skip the Bin 36, Sam's and other wine stores, which are more focused on marketing and a bit of partying atmosphere....though they are fun to take to get your feet wet.
CWS has bread and wine and water...that's it. CWS provides handouts and lectures and then you taste comparison wines. E.g., you drink an American oaky chardonnay and then a French White Burgandy (made from Chardonnay grapes). This is the way to learn: style, grape qualities, geographic characteristics, etc.
Patrick also teaches several one night classes and you may wish to try one of these to get your feet wet. Or beg him to let you sit in on 15 minutes of a series class. BTW, I knew a little bit about wine before going to CWS, so I skipped the Basics and went straight to Varietals.
FYI, a graduate of three or four of his courses owned the now-defunct Wine Crier (had a great concise selection), you will get lots of knowledge quite quickly. You will then be able to cut through a lot of the BS marketing that goes on at restaurants, bars and liquor stores (all places that have tastings).
Whether you take the class or not, pick up Zarely's WOTW book, the best $25 you will spend (including buying wine)...it is a concise manual to train waitstaff (some with limited education) on an impossibly large collection of wine (WOTW had over 5,000 individual wines). Reading this book cover to cover (I think less than 100 pages) will put you light years ahead of most people. I have purchased more than 10 of these for friends and family.
...and finally, drink! Find friends to drink with and share the expense, find places to go and try wines, hit the free tastings.
....and now really finally, keep it fun. I find nothing worse than wine snobs. I wouldn't deconstruct, criticize or comment on a host's choice of flowers, table setting or food and I don't think it is any more appropriate to do so for their choice of beverage, even if you happen to have some knowledge in the area.
People also like to talk about other things at a party. Keep your in-depth analysis of oak and tannin and terroir to tastings and purchases, this should be the advance work in selecting a wine for a party, not the topic of conversation at a party. The only thing that should be heard at a party is "Wow, where did you find this?" To which you will reply (with a wink) "Oh, its just something I picked up!"
Hope you have as much fun.
Unchain your lunch money!