Calculate Duration & Resources

Hi,

I have a project that we're hoping to start this week or next week & complete by 12/20/12

My basic scenario is:

-- Through the WBS (to the left), I may have 300 items to complete & I have an Average Duration that could change in Cell BH 62
-- Based on Average Duration & Quantity, seeking functions that can calculate the Estimated Workdays Needed, then break that down to Estimated Hours & then the # of Individuals
Needed
-- I think once I have the above, I can graph out a forecast


Please see example file.

Thanks for the assistance.