State taxes - resident/non-resident

I am an Indiana resident.  I work in Illinois, which is a considerable drive (3-4hrs). I have a small apartment in Illinois.  I will maintain my Indiana residency and homes there.  I'm home every weekend and holiday and many vacations.  I work remote maybe one week out of every month.  how do I file?

 

My primary employer is in illinois, and I run a small business in Indiana.