there's substantial wisdom in the common suggestion to spend a year observing the land in question before doing anything else.
strict adherence isn't entirely necessary, but the kernel is important: in our haste to see results, we frequently waste time and effort. making mistakes will always be part of the process, but knowing a little bit about the cycles and flows and seasonal changes of a place will go a long way. talking to locals will be a great complement to your own observations. ask about prevailing winds. crop pests. what grows well. what tools they use. there's no guarantee that
local folks don't have bad habits they'll try to talk you into, but they certainly know more about the place than you do. talking to locals
should also jive well with the communal efforts you mentioned.
specific to your place in Nicaragua: things happen fast in the tropics because of the relatively constant temperature and sunlight. sounds like one of your major concerns is going to be how
water moves across the land, though that's true for most places. a place prone to flash floods above a cliff sounds... like an interesting case study. capturing that water and storing it in soil is useful to a point. depending on the particulars of that soil, though, too much water could send your property over that cliff. there might also be potential for a small hydroelectric installation, if that sort of thing interests you.
there are a few large-ish
permaculture operations in Nicaragua that you could probably visit. just don't assume a person is a saint only because s/he is interested in permaculture. it's certainly a mark in their favor, though.
there's plenty you can do while you're in Seattle, too. maybe start a worm bin. is there landscaping at your apartment? grow some things in there. have access to the roof? friends with yards? grow some things there. friends with
chickens? start a soldier fly larvae bin to
feed those
chickens and eat your shit (the larvae, not you). setup a small
aquaculture system in your apartment or elsewhere. get some
mushroom spawn and grow some mushrooms on
straw or
coffee grounds or a chunk of alder or sawdust. practice grafting on some of the many ornamental fruit
trees all over the city. see if the Seattle
Permaculture Guild is still active and go to their events. visit some of the permies out on Vashon. or out in Duvall. or Bainbridge. or Olympia. plenty of folks around doing cool stuff, and many are happy to talk about it with interested strangers. read, if that's your style. there's no shortage of literature available.
I hesitate to suggest volunteering on farms, because a lot of folks make their living
working on farms and you could be undercutting that. I'm not a fan of the intern model, myself, but plenty of folks are. an apprenticeship arrangement is something I could get behind, though. not sure how easy to find something like that would be.
if you're serious about trying some of this stuff out, you might consider joining
FarmLink. Mary connects folks looking for land with folks who have land available. it isn't a sure thing, and there's a fee to join, but it could help you out.
and I think I've gone on long enough. so I'll bow out for now. good luck.