Go to amazon and buy Earthbag Building by Kaki Hunter and Donald Kiffmeyer.
Its the best book on the subject out there. Other than that, its all trial and error. Build something small first and go from there.
Earthbag building is great for people who have lots of time and little money. It is very labor intensive and will show what kind of friends you have
but in the end you will have a house that will stand up to anything.
We built a
root cellar and couldn't be happier with the results.
On the other hand, if you have lots of money and little time, I would build with ICF's. Our house is built with them and it preforms better than hoped for. Warm in the winter and always cool in the summer.