Garmin route planning

I am having trouble doing a route on my Garmin. Seems that lately I have been crossing Illinois through Chicago. I work for an O/)) and he likes to avoid tolls where it is easy. I also like to avoid Chicago. I used to go Around Chicago by taking 39 from Wisconsin and then using 80 going East. I am coming from NJ and he wants me to take I-70 to Indy and then 74 to 39. I can do it without the GPS but still like having it show me the way. I tried inputting my present location ( Hebron,Ohio) and then Mpls. Garmin wants me to go around Chicago on 90/94 and 290. I tried entering cities along my route but then the GPS assumes I am going through those cities and takes me onto city streets. How do I get the GPS to take my route? On the way East when I left Rochelle to go down to I-80 the GPS kept telling me to go back. Finally after 3 exits it figured out my route! I don't think the problem is the GPS. It is ME! Help appreciated.

 

Thanks for the replies. I have used truckmiles.com and it is not bad. The best routing is from PCmiler. Part of the problem is the crazy route he wants me to take. When I left NJ I wanted to get up to 80 and head west. I know the route and it is straight forward. Instead he sent me through Philly and I paid almost $40.00 to cross the bridge. Crazy traffic and slow. I finally got the Garmin to route me to Bloomington/Normal. Once I turn onto 39 I will just route to Mpls and I will be good to go. BTW: The Gar mon took me into NJ right to the Costco distribution center. I was impressed. I watched a video on entering waypoints on the Garmin but with my big fingers I found it hard to do. You have to enter the waypoint outside the city or it takes you right into the town!

 

Crossroads: Thanks. I will try that