The LCMS website provides a wealth of resource information to meeting your personnel needs, including a sample Employment Resource Manual that you can use as a template to create something that applies to your individual ministry.
Other resources provided for download on the LCMS website include sample Performance Appraisal Worksheets, sample Job Descriptions, and a sample Congregational Constitution and Bylaws Guidelines.
All of these resources can be found on the Church Office Administration Resources page of the LCMS website.