If you use TurboTax to prepare your state return, when you choose to print "All Official Forms Required For Filing", you will have everything that you need to include except for the copy of your W-2 and any other tax forms that show Illinois state tax withholdings (as mentioned by Mike9241). There should also be an instruction sheet that will let you know where to mail the return.
For further information, here is a link to the 2022 Illinois Income Tax Instruction Booklet.
@bechicago90