Create reports from Excel Spreadsheet

I want to measure timeframes between milestones in each of our construction projects so that I can monitor the performance of our contractors, suppliers & employees responsible for each task. I created a spreadsheet (attached) to enter the date each project stage is submitted/completed as we progress through each project. What I want created is reports or tables for each milestone/stage, eg. A report/table called Certified Plans as at (today's date) would contain the details of only the projects which have a date entered in the Request Engineering row. (If there was text in the field, eg. N/A it would not select the project). It would then tell me the date engineering was requested, and the number of business days (must exclude weekends) it had been in engineering/waiting for certified plans as at today's date. The report would be sorted by number of days in engineering with the longest number of days at the top of the report. I would also like a report that gave me monthly stats eg. average & median number of business days that projects are in engineering. So for each stage in the project lifecycle I am looking for a report telling me the outstanding projects that are at each point, and a report on the monthly performance stats for each stage. To summarise it is really just 2 groups of reports - those highlighting outstanding items at each stage & those providing monthly statistics on the performance at each stage.