COR with two trade names/businesses

Hello, finally got my COR after a long week of going to the BIR. Anyway, so I have two businesses, in the same address, so I opted to put them under one COR (sole prop). They are in one COR with two trade names. One's retail, one's a services company.

Now researching taxes written on the COR (percentage tax quarterly, individual income tax quarterly and individual income tax annual)... I have questions...

- How many books, one set or two?
- How many receipts should I ask the printer to make, one or two sets?
- How many filings for percentage do I make? Only one for both or two filings for percentage (quarterly)?
- For the other two taxes, I assume it's one filing because it's an individual tax. However, does that mean the taxable income for both is combined?

Thank you very much for the help.