You will find a lot of information on Hoffman(n) at the following sites: http://www.2manitowoc.com/
There is a search box you can use. For Sheboygan county use the following: http://www.rootsweb.com/~wisheboy/
Click on "The Sheboygan Genealogy Page" and you will find a search box. If you enter Hoffman it will show a lot of links.