So there are reives, skrimish, delves, and fractures. But what order am i meant to do these in and whats needed for each? The wiki has just left me confused.

For example. Lets say i want the Yaoyotl Helm. What series of events do i need to get to the correct fight to earn it?

Or one of those new weapons? like the Buramenk'ah.

I understand some gear is from the NPC, but some of it isnt? but i need key items?