Excel Formulas Guru

Hello I need an excel guru who knows formulas for a Maximum 30 mins as I need 2 formulas to do the following: Look at Column C in 'Master' sheet - Take first Cell, then compare this with Column A in 'CostData' Sheet - if it matches then Add Yes in Column D & copy Cost from 'CostData' F to 'Master' - Column E - Repeat for all remaining Cells in Column C Take the Item Number in Column A, Generate a barcode in Column B.. The barcode is 13 digits Honestly very straight forward. I know this will need vlookup, if, match or similar formula.