When you remove the egr valve there is a gasket. Just reuse it with the block off plate. As for vacuum lines. You should get rid of all of them except one from the intake to the fpr. Intake to the bov, intake to the pcv valve and intake to the brake booster. If you have a boost controller you will need one to go to it. You T off off the one going to th bov for the boost controller.
All the vacuum nipples on the throttle body will need to be capped off.