Cheap and sustainable material to build a homestead.

Greetings! I'm considering a place of my own, either in a wooded or rural area near the city where my folks live, and I'm looking for more help in finding inexpensive and substainable material that's more eco safe. I wanna find out where can I get the stuff from. I'm also looking for more ways to run my water and electricity from an off grid area. Please drop in if you have anything for me. Thanks.

Look at my signature, it has details of rainfall catchment for use in a home.
The range of materials is extensive, do you have anything in mind as a starting point?
Nothing will be 'cheap' so remember that.
What sort of land, rocky, muddy, great soil, trees al this is important knowledge to start planning?
Do you have a ute, small truck or a trailer to carry things?
What area re you planning, does the town have junk yards etc?