Hi Regina:
Due to the small number of trees you have for sale, I would encourage you to simply work with a local logger. Had you wanted to harvest timber off a larger tract of land, I would definitely encourage you to work with a professional forester.
However, in your case, working with a local logger will work just fine.
Below is a list of licensed and bonded timber buyers / loggers here in Illinois:
http://dnr.illinois.gov/timberbuyers/
Best of luck!