New to Word on MacBook

I have just bought MacBook Air and so far the set up has been OK. Big problem is with my Office subscription. I have downloaded Office for Mac but it seems impossible to customise Word or Excel in the way I have it on Windows. I can't even add the same customisation to the Quick Access Bar

Has anyone had problems switching from PC to Mac and if so, how did you resolve it - short of keeping a PC for Office!