Where can I find some guidlines for writing progress reports?

You can find some guidelines through this link http://management.about.com/od/managementskills/a/How-Write-A-Progress-Report.htm

Every company has a format to report progress.
If you do not have one try to get a sample from internet and start using.
Your management will react and suggest changes based on business need.
Then you will start modifying it.
Ultimately your format will be developed with the passage of time depending on your need.