The answer to your question is, "It depends."
Listed below are several of the variables you need to know prior to making tree species selections:
Flood frequency? Soil type, pH, drainage, texture, etc.? Site / topography? How many trees per acre? How much money are you willing to spend? Fast growing trees? Hardmast species such as oak, hickory, walnut? What is your overall goal / objective?
Obviously, your question is much more complex than you let on. Therefore, you will need to work with a professional forester to help you navigate these questions / variables.
Please contact your local IDNR district forester to assist you with your reforestation project in southern Illinois: