This is my old NG Pro tutorial, it'll work for 360 version. I use super easy/safe strats that work well for marathons.

This tutorial's cabin strat is the one Morse taught me. It's very consistent, so you can reference this for an explanation: But watch Phaero0 cabin too (time 16:32): And Phaero0's waterhall strategy (time 28:52):

Check out some other runs too. The more runs/runners you watch, the better you'll understand the strats. Cabin, waterhall, elevator, etc. all have a lot of small details that are actually very important.

Anyways, try a couple of NG Pro runs and see how it feels. Let me know if you have anymore questions.

I could answer questions too. I am not great at NG but I know it well at this point and since I recently took a break from NG+ to get a decent NG time, it is still fresh in my mind