State tax filing

Thanks @Cynthiad66 and @DMarkM1 for providing clear answers and appropriate pointers. I appreciate the help.

I need two followup clarifications:

1. I need to file with IN and IL. Based on the link you shared, I don't think that it is must to file federal extension for getting IN and IL extension (see the screenshot below). My understanding is that if I file for federal extension I will automatically get for IN too. However, I have already filed my federal return with form W-7 (ITIN for my wife). So, I don't need to file an federal extenstion to get IN extension. I just need to file with IN separately. Right?
2. The link says that to avoid penalties and interests one should pay by April 18 if they owe. However, since there are errors in my W2, I cannot calculate the exact amount I owe till I don't get corrected W2. So, I am assuming I can pay a lumpsum (upper limit) now and then will adjust it in the final returns and may get some return later. Is that correct?

Thanks,