Compute Project Start/End Date

I need help computing the Project Start Dates for each US state marketing campaign, under the Attached File "Strategic Plan" tab.

Column E: Total Number of State Contacts
Column F: Estimated Processing Time - calculated as =E2/(9*4.33) meaning, I could process 9 contacts per week in a given month, resulting in an answer in months.
Column G: Project Begin Date: If I started my first state (Row 2), on February 1, 2011 (provided it's a weekday, because it will only be workdays), when would I complete the project (February 1, 2011 + results of Column F)
Column H: Project End Date: What date will the project be completed if began on February 1, 2011 for Row 2 and so on?

Column G and H are dependent upon each others similar to that in a Gannt's predecessor task, where Column G (Project Start Date) is at 02/01/2011, the processing time is "x.xx weeks", giving a task completion date of xx/xx/2011, which date also serves as Column G (Project Start Date) of Row 3, and the process continues until all the row data has been completed.

Thanks,
Penny