rushing saturday!

So I'm rushing on saturday, kinda nervous! but I have a few questions that I hope you guys can help me out with.

1. Are flip flops approperiate for the first day since it's the most casual?

2. I'm a junior, I know I might be at a disadvantage, can I do anything that will make me stand out?

3. Can someone explain the process to me a little more, I'm a little confused. So the first night, you go to all of the houses, do they make their first cut then, so you might not go to all the houses again the next day?

4. If you go to pref night, lets say you are invited to 2 houses, since pref night is the last night before bid day, does that usually mean that you are getting a bid? Can you go to the pref night and still not get a bid on bid day?

5. Is bid day done infront of everyone? Meaning, do you personally get an invitation or gather somewhere and they will call your name if you got a bid?

I'm sorry I know that's a bunch of questions, anything will help!!
fadyas