What entity do i need to get invoice details with products associated with it - CRM online 2011

Hi All,
     Quite new to CRM development.
I need to retrieve the following from the invoice entity

Name
Customer
PriceList
Detail Amount

etc....

I know there is an invoicedetail entity but it only has 2 columns : productid and invoiceid.

What entities do i need?

Thanks in advance