Clean Install of Windows 7/10 on Bootcamp

When I bought my Macbook Pro in 2012, I partitioned the hardrive and installed Windows 7 using Bootcamp. 4 years on the Windows 7 (I briefly availed of the windows 10 upgrade but had to revert back to windows 7 as key features as the trackpad would not work).

Would anyone have a step by step procedure on how to do a clean install of windows 7, with the option of upgrading to windows 7 on Bootcamp, in same way you might do a clean install of windows on a PC?