Reddit mentions of Wyrdwalkers: Techniques of Northern-Tradition Shamanism

Start with Neolithic Shamanism by Kaldera and Krasskova

Then start Kaldera's Northern Tradition series:

Jotunbok

Pathwalkers's Guide


Wightridden

Wyrdwalkers

In the meantime, start searching for the Galdrbok by Johnson and Wallis and read that when you can get a copy.

That should give you about 3-5 years worth of training material. Once you have worked through it all, set it aside and focus on how the spirits you work with encourage you to practice. All of the above authors have their own practices and much of what they offer will not be completely true for your work. Learn the skills that are presented, make them your own, and then foster your relationships with the spirits from there.

Yes, I have experience with this. I am from Iceland and learned a lot of it from my mother.

We use Runes to form the conduit, to route our conscious. As of such Runes are tools, which can be expressed as sound, color, form or anything. The most important thing is that you build the connection. Reading them, singing them, making them. Runes reveal their powers. Sometimes all at once.

I think the Nordic system is a bit difficult. We use Uthark and Galdrastafur like Mandalas to hide the runic expression from the intellect. That can appear in Sigil like creations, if you follow the Chaos Magic approaches today.

I have experience with Thursian invocations, based on Uthark. If you are looking for your spirit development, I recommend to align with something that calls to you. That worked for me. Everyone has a different call. I have contributed to Wyrdwalkers a little. You might find that helpful.

https://www.amazon.com/Wyrdwalkers-Techniques-Northern-Tradition-Raven-Kaldera/dp/0615139442