TurboTax will print out the forms that are required for your Illinois return.
If the IL-1040 is the only form that it produces, then that is your entire Illinois return.
Be sure to keep copies of your tax returns, either print or electronic, for future reference. If you use TurboTax Online, then the only copies are in the cloud. You won't be able to get copies of them next year without a paid copy of TurboTax Online for 2017.