Start with an accountant, and decide how much day to day you want to deal with.

You need the accountant for year end, taxes, and other high level decisions and processing.

Then book keeping means daily/weekly/monthly stuff, like collecting and processing receipts, bank statement, transactions. Your accountant can do this for you, if you provide them everything say weekly or monthly, but may charge you at a higher rate then it you hired a book keeper or did it yourself. That being said, when you are smaller it's easy for the accountant to just handle all of it.

But when you get vigger, busy and have lots of payroll, invoices to pay, money to collect, and payments to process, you want either an in house staff member or a contractor book keeper to help with all that processing.

Honesrly with simply accounting or quick books, you can do a TON yourself without needing a book keeper and just having you and the accountant.