Excel template

I am building a new small freelance company, and as such, need building new branded templates. One of them is a timesheet (or monthly report), whereby I submit what's been achieved last month, with hours spent and comments. I need the excel sheet to fully fit an A4 page, without any white margins remaining at the edge of the sheet, when converted to PDF. I've attached my colours and sample branding. I'd like help with creating a really nice, easily editable version. I believe this is a very small project for someone good in at Excel.