Concerning mailing filing: do I need to print out all forms generated or only those that are generated by the printing option? Also can I use Turbotax-generated W-2s?

If I switch to forms option, I see not only Forms and Schedule forms, but things like Tax Payment and Info Wks- do I need to print all of the generated documents? Also- for the Turbotax-generated W-2's and 1099's, can I print these or must they be copies of the original documents?