Help with MWToolkit and importing data for invoicing.

I have been spending a little time looking over the manuals, but I just can't seem to figure it out.
I need to get some external data into Peachtree without manual entry.
Most likely it will be with ms access.
I have Peachtree Quantum setup in a test environment and do have a registered copy of the Toolkit.
We only do the sales invoicing, no quotes, orders, or other Customer Transactions. All we do is go to the Sales/Invoicing screen and choose a customer, enter the date, invoice #, line item qty and unit price and sometimes some freight.
Can anyone lend a hand?
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