Define pay and promotions / how to invoice

Explain your methods of payment and let employees know when they will be paid (e.g. every month, week, two weeks). Include your overtime policy, define work hours and explain the pay grade structure so that people know where they fit in the hierarchy. 

Include information about the compensation packages you offer, let the employee know if she/he is eligible for bonuses or stock options, how their performance appraisal process works.