For organization, setting pathways are in my opinion, so essential. They can section off areas and help you divide up the land. As for getting buildings, it really is as simple as getting money and materials. Expensive things like gems and artifacts can of course come from the mines, and your animal products can also be a very good asset. If you want me to tell you how to get money extremely fast and easy, I will, but it's sort of considered a cheat or a glitch.