Reply to Any excel experts out there?

Need help with a function to pull information from anther sheet, based on a two search criterias.

Trying to create an invoicing system. I have a worksheet with loads of records holding information about jobs. I have another worksheet that is basically where an invoice is created. The invoice worksheet will have an area for date entry and also a customer field. It's these two fields I need to be used to then pick out entries from the first worksheet with all the info on.

Any clues on functions to use for this or websites with more information would be really appreciated.

Cheers
MMM