I suggest
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Look at the report you have had in the past. Both what useful information they provide and what is missing to keep you informed about how your business is going.
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Create test businesses in Manager and see what reports it generates and how information is entered.
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Discuss what you think is your best chart of accounts with your accountant.
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Ask here if you have concerns about how to solve a Manager implementation issue when you have an idea of what you are trying to accomplish.