While I don't live there now, I grew up in southeastern WI (Racine). What is it that you would like to know? There are plenty of sources on the Internet for the basics (population centers, history, politics, etc.) I can tell you that outdoor activities (hunting, fishing, softball) are popular, as well as drinking. There is no shortage of bars and taverns in Wisconsin.
Big cities are mostly in the southern third of the state. Big meaning more than 50,000 people. After you get north of Madison the population density drops rapidly. The people are pretty friendly, mostly.
If you don't like cold, stay away. The winters are usually fairly mild, at least in my home town, but every 5 years or so there is a nasty cold streak. -30 sucks no matter how much you are wearing. Summers can be wicked hot, and always humid (not like Orlando, but more than I prefer.) And if you have a fear of tornadoes, it's not the place for you. It's at the northern end of tornado alley and a few towns have been scrubbed clean.