Building an initial structure is an excellent idea. You can gain experience, perfect your techniques, and have a place to safely store your house-building materials.
A few years back, a guy had a bunch of lumber delivered to his house site (he lived elsewhere). Someone came and took all of it. Kind of made me wonder about the person who delivered it... The paper said they had to have had a boom truck to take it.
boy would I be ticked off! a guy that lives across from us now started with just a privacy fenced area for his stuff. built a garage for his stuff and then bit by bit built his house on top. he still does works on it off and on. built another room on the back last year. I have alot of respect for him for that.