Excel spreadsheet

General information for the business: we are a training broker
Industry: Business
Description of excel work: I need a spreadsheet that needs to be created that will allow me to track sales along with training dates.
Column 1 = Booking Number ( this is just a text column, no formula)
Column 2 = Buyer (this is just a text column, no formula)
Column 3 = Provider (this is just a text column, no formula)
Column 4 = Course title (this is just a text column, no formula)
Column 5 = Date of Course (this is a date column which will be manually entered)
Column 6 = Date of Booking (this is a date column which will be manually entered)
Column 7 = No of places (this is just a text column, no formula)
Column 8 = Course Cost (this is a pound column which will be entered manually)
Column 9 = Course Cost Inc VAT ( this needs to be a formula which enters column 8 figure plus 20%)
Column 10 = Sale Price (This needs to be a formula that enters column 8 figure plus 15%)
Column 11 = Sale Price Inc VAT (this needs to be a formula that enters column 10 figure plus 20%)
Column 12 = Profit ( this needs to be a formula that enters the difference between Column 8 and column 10)
Column 13 = Payment Terms (this needs to be a number column which is manually entered)
Column 14 = Payment Due in (this needs to be formula which enters column 6 date plus the figure entered in column 6)
Column 15 = Payment Due out (this needs to be a formula which enters column 5 plus 30 days)
Column 16 = Invoiced out (this is just a tick column)
Column 17 = Invoiced out (this is just a tick column)
Extra notes: This needs to be completely editable so any future changes can be made