This is by far, the most critical advisory role you will have. Your accountant can help you analyze and manage your spending and provide advice on the tax implications of your financial decisions. He or she can also prepare your tax returns. If they have been working on your account all year, they will be familiar with your situation and the preparation of taxes should be relatively painless.
You may decide to retain both a bookkeeper and accountant who will work closely together in tracking and overseeing your financial activities. The bookkeeper would be useful for doing relatively routine activities such as entering expense receipts, checks paid and payments received into your accounting software. You might even have them write out checks and pay your regular, monthly bills. He or she may not be knowledgeable enough to provide advice but will probably be much cheaper than your accountant for basic financial recordkeeping activities.