I'm planning to jumpseat on a couple of TSA flights next week BNA-ORD-BNA. I've never flown on TSA before and have a couple of questions.

What is the procedure for listing/checking in?

What is the dress code for jumpseating?

Am I correct in thinking that the ER4 is iffy with regard to taking a full load plus jumpseater?

I'm going to visit a friend who flies for Skywest in ORD and, since these are UX flights, he's checked loads for me.

Thanks...