Can you camp out over night ? If so when should I show up to the line (Week 1 SS18).

No

Camp out a day before.

They are not letting people camp out anymore you have to sign up for there email address.

I would get there at least a day early since it's the first drop of the season. Check instagram and look at what people think will be dropping this week and you can decide to get there earlier if its hype or you can get there like 20 hours if its not too hype