When building on your own land you're already one step ahead, at least you know where you want to be. I am also assuming the land you have, is able to connect to public water and sewer (if not read the recommend post below).
First things first. You need to know what you want in a home. Read "10 Things You Need to Know Before Contacting a Custom Builder". Knowing these specific items will help a builder be better able to price a home you want.
** I'm assuming you already have the land. If not read this sister blog post first.
When building a home with a custom builder on your own lot there are two ways builders usually like to handle funding.
We could make up some fluffy reason why an agent is needed in this situation, but to be honest we aren't needed. We'd only end up costing you more and not bring any true value. However, feel free to ask us for recommendations on builders if you need them.