In the current coronavirus situation, you may not have the data you would like and historical data might be a very poor indicator of the future, but a key tip is to really think about what information you need to make decisions.
With the cornonavirus pandemic some businesses have been able to respond easily, whilst others have had to scramble to respond to the new world with teams separated for the first time.
Businesses might be familiar with planning on a gradually evolving basis, modelling a small number of variables each year. But the current circumstances call for something more radical.