I've been to four kpop concerts but I think I'm not the right crowd to attend them. I enjoy watching while sitting and I prefer clapping to screaming and I like singing along to songs instead of singing fanchants. I also hate hi-touch, it's so embarrassing, and I've only done that once with AB6IX.
Do you have a cute outfit planned?
I also recommend buying some kind of merch as a souvenir, take photos, and take at least a few videos. I usually forget the entire experience because it stresses me out so much so it helps to relive the joy and emotions by rewatching the videos/photos. Don't be afraid to interact with other fans, especially if you're lost in the venue or need something, they're all usually very nice and happy to help. Take photos outside the venue, inside, and at your seat is my recommendation. Use the venue's official hashtag on twitter for information from other fans, especially people handing out freebies. This will probably be something like #NCT127_In_LOCATION but the official twitter of either the group or venue should make it known by tweeting our the correct hashtag.
I recommend not bringing a purse/bag, I usually keep my keys and wallet on a carabiner and hide them in my waistband (on the inside of my skirt/shorts or attached to my person somehow. This will save you time walking through the venue's metal detectors and you won't have to worry about anything being stolen. You have an NCT lightstick, so definitely replace your batteries with new ones before the show.
Look at parking beforehand. Are you parking on the street or have you purchased a parking spot or are you parking in a garage? Familiarize yourself with the roads surrounding the venue so you can see how you're getting in and out, this will help when you're actually there.
Don't bail, you've got this. I believe in you