At this point, you've got the Playbook, the Game Preview and the Match-Up Report. Is there anything else you think you might need? Probably not.
Don't go crazy and over-invest in a Showdown Slate. Understand that any combination you just thought of, was probably thought by someone else. You stand a better shot playing in Single-Entry contests than you do in Multi-Entry and even that is a huge longshot.
Below are a couple of examples of lineups you may see in some contests, but always try to build your own.
Enjoy the game!