I suggest you get some "people". Yeah, some extra hands could come handy.
Other than that you need some book keeping software (QuickBooks) and inventory control system which may already be included in your shopping cart platform.
A good software is MOM (Mail Order Manager) although it is kind of complicated to integrate with some shopping carts. It keeps everything centralized; contact information, shipping addresses, billing addresses, inventory, credit card information, etc.
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