merging multiple excel sheets into access

I have some great excel spread sheets I have created with the help of the excel forum. Alone the are sufficient for our business to function but I think they would be far more useful if they were combined in an access program.
I have looked through all of the samples and dont think any of them match exactly what I would like to do.
It mainly consists of creating an order, comparing pricing, and creating and invoice. all of the information needed is already on the 3-4 seporate sheets.
Can anyone guide me on where to begin?
thanks in advance