Numbering Structure: Chart of Accounts

Using a numbered chart of accounts, how should the accounts be numbered below in QB? I don't want to run into any reporting problems down the way because I didn't number the chart of accounts properly. I have below an example chart of accounts under the "Assets" category.

Assets
--Cash and Cash Equivalents
------Operating Checking
------Savings/Money Market
------Savings: Restricted Grants

--Property, Furniture & Equipment
------Land
------Buildings
------Equipment

Thanks,

Ryan