Which reports do you use to get accurate sales figures?

A company that I have recently started working for has acquired a business that is turning over £2k-£3k daily on Amazon.

I have found the ‘Seller Fee Invoices’ in my ‘Tax Document Library’ which seems very straightforward, but I am really struggling to find a report that gives me a monthly sales figure (less returns) with breakdown of VAT due. There are hundreds of sales every day, so it is impossible to go through every order and I would love a ‘snapshot’ of monthly sales that I can enter as one figure into SAGE.

So, I guess my question is, what reports does everyone use for accurate sales figures? Thanks in advance… Any help or guidance would be appreciated