IT Administrator for a company implementing a new AD DS infrastructure. Develop a list of business-related questions that you will need answered in order to accurately design a domain hierarchy

You are an IT Administrator for a company implementing a new AD DS infrastructure. Develop a list of business-related questions that you will need answered in order to accurately design a domain hierarchy. Your job is to determine number of DCs, geographical placement, number of domains/forests and OU design. What do you need to know to effectively accomplish this?