Reddit reviews Hal Koerner's Field Guide to Ultrarunning: Training for an Ultramarathon, from 50K to 100 Miles and Beyond

https://www.amazon.com/Koerners-Field-Guide-Ultrarunning-Ultramarathon-ebook/dp/B00MYEQGFI

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https://www.amazon.com/Relentless-Forward-Progress-Running-Ultramarathons-ebook/dp/B004WE78IC

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Both books come highly recommended. Also search for the science of ultra podcast.

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Good effort on this one. If you want to do a long run like that you pretty much need to train by running. Not fast running, just getting out and logging miles. Hiking (i.e., walking) is good, too, but if it's intended as training for ultras you want to keep your heart rate up there quite a bit, which you can do while hiking up ("power hiking"), but not really if you're just hiking on flat or downhill. Plus you have to get your body used to the pounding of running; it's much higher impact than hiking and you need to slowly build your running body up, otherwise you'll get overuse injuries.

There are good resources out there on how to train, e.g.,:

http://www.irunfar.com/2007/10/training-for-your-first-ultra.html

and some good books:

https://www.amazon.com/Running-Your-First-Ultra-Customizable-ebook/dp/B00VE731IG

https://www.amazon.com/Relentless-Forward-Progress-Running-Ultramarathons-ebook/dp/B004WE78IC

https://www.amazon.com/Koerners-Field-Guide-Ultrarunning-Ultramarathon-ebook/dp/B00MYEQGFI

I would agree with the above, really there's nothing special needed just to start running trails. As you start going farther distance from civilization or more time spent on trail, things may crop up that you would need like water, nutrition, and safety stuff but you can do that as it comes up.

I bought Hal Koerner's Field Guide to Ultrarunning a while back, and while all the info in it can be found on the internet here and there, I thought it covered everything you'd need to know about trail running well in one book.

https://www.amazon.com/Koerners-Field-Guide-Ultrarunning-Ultramarathon-ebook/dp/B00MYEQGFI/ref=sr_1_1?ie=UTF8&qid=1495797289&sr=8-1&keywords=field+guide+to+ultra+running

Ultra running:

• Relentless Forward Progress
  
• Hal Koerner's Field Guide to Ultrarunning [new]
  
• Running Through the Wall
  
• Eat and Run
  
• Finding Ultra