To start with, understand the company's dealings. Go through the company link properly and learn about the organization.
Make a Policy Manual
Make a policy manual containing the whole structure of the company. For policy-making, talk to your management and approve each clause, such as Position Category, Office Time, Salary Accounts, Lunch Break, Tea Break, National Holidays, Leave Policy, Termination Policy, Office Infrastructure Policy, Medical, and other things you would like to add.
It is not easy to document it in a week's time. For all the above functions, you need to sit with your management and decide.
Also, with recruitment, you can start. If you are in a small organization, please gather all the requirements as per the recruitment needs and do the needful.
If you need any assistance, do let us know. It's a very challenging experience to create the company structure, so work hard on it. I am sure you will enjoy doing it.
Regards,
Bhavna