Being in South Florida I can not give you any information on who to buy from but I will tell you to read up on the proper care of any orchid you are going to buy before you buy. I did not do that and paid the price. The information now available on the internet is certainly a good thing for a beginner unlike when I started keeping orchids at about the age you are now.
I see that the Illinois Orchid Society Show is March 13-15, 2015 at the Chicago Botanical Gardens which would be a good way to see lots of orchids that do well in your area as most vendor's bring what grows well in you area and talk to the vendor's they will give you a lot of information. You might also check to see if they are going to have any lectures during the show, you will pick up lots more information. I am still learning after doing this for so long.
Good luck and keep us posted on your progress, it never hurts to ask if you have any doubts. Welcome to the Orchid Board!!