Need help with $3$ and $4$ im stuck on those

A report of whether the company should continue to purchase the part from the supplier or begin to produce the part itself. Include the following factors in your report:

An analysis of the holding costs, including the appropriate annual holding cost rate.

An analysis of ordering costs, including the appropriate cost per order from the supplier.

A development of the inventory policy for ordering a fixed quantity $Q$ from the supplier

Include the following in the policies of question $3$:

a$.$ Optimal quantity $Q^{**}$

b$.$ Number of order or production runs per year

c$.$ Cycle time

d$.$ Reorder point

e$.$ Amount of safety stock

f$.$ Expected maximum inventory

g$.$ Average inventory

h$.$ Annual holding cost

i$.$ Annual ordering cost