Monthly payment to establish

Do I need to pre -make repairs and buy new furniture? What amount of the monthly payment to establish? Rent an apartment officially or not? How long should I take? Is it possible to develop a lease agreement yourself or it is worth entrusting this issue to lawyers? Whether to use the services of private realtors or contact the real estate agency? Or can you look for potential tenants yourself? And where to look for them? It’s quite difficult to figure out this kaleidoscope, so we will consider each of them in order.