Hi Partner,
I believe it can be expected that with a huge initial investment being put into a startup company, they may want to reach the breakeven point as fast as possible. This could result in long hours of work, wide variations in salaries among reportees and team leaders, fewer leaves, cost-cutting measures on administrative facilities, etc.
So, for a start, you could try working on policies related to leave and attendance, compensation, statutory benefits such as PF and ESI, code of conduct, and performance management. Candidates may want to know more about compensation and benefits before joining, so you could prioritize these for quick formulation.
Hope this helps to start.