At first, prepare the content list for the handbook that you need to create. Finalize those and maintain a skeleton for all policies to be included in the handbook, such as Objective, Scope/Applicability, Slabs (if any), supporting forms, and formats. Work on each policy individually and conduct benchmarking with industry specifications and government regulations. Don't forget to include any allowances for a startup company—your boss will appreciate it. Document the policies consistently and keep the content of certain topics intentionally vague (especially regarding CTC); it should not be overly precise to allow for adjustments. Best of luck with the job!