KCON HELP GA/EXPRESSSS

I’ve attended Kcon for the past 2 years but this year is the first year i’m doing GA because PREMIUM is only GA, which sucks because i’d prefer to be seated. But regardless I would like to know how it works because i’ve never experienced GA at all. So if you have information please let me know, do i need to line up early for a good view? but i also don’t want to camp because im getting premium for the festival ground benefits… Also i did buy express and if i buy a ticket for myself and others would those benefits apply to them as well? I just have so many questions, any advice helps. Thank you.