Your post is a little vague, so forgive me if the following doesn't apply to your situation:

Have you been given permission to build two dwellings on your lot? Our county made us build our home and shop simultaneously even though they were two separate permits. Will they let you build one, then another later?

If you're at the very beginning stages, your county Building Inspection Department where the homes will be built will be your first stop, They should have a website. I advise you to actually visit...if you don't have permits yet, you're going to spend some time there anyways.

if you are going to have a Homebuilder construct your dwellings, they would handle the permit process- at least that is how it works in my county.

What about home plans? Do you already have them? Are they brought up to building codes in the county where they will be built?

Your county should also have a Home Builders Association with home builders listed in your area.

Your local building supply yard that supplies the majority of home builders in your area are a wealth of information. They will help you if you're going to act as your own General Contractor on your build, or steer you in the right direction on who could build your homes. They also know who doesn't pay their bills, and who to stay away from.

I would also make sure all contractors/subcontractors are properly licensed. There should also be a website to look up a contractor license numbers in your state.

Good luck!

Will the homes be for personal use or will they be rented out? If they will be rented out you need to make sure rental properties are allowed in the neighborhood. Someone owned a home in our neighborhood that they tried to sell because they were moving out of state. When they couldn't sell it they tried to put it up for lease. It turns out that our neighborhood association doesn't allow for rental homes so they got in trouble. Don't assume that just because another home in the neighborhood is a rental that it's legal. They may be doing it under the table or may not have gotten caught yet.

Another reason I ask is because building to rent or building a spec home is quite different from building for personal use. The materials you use for a rental need to be inexpensive but hard wearing and durable. Both a rental and spec need to appeal to the prospective customers which may not be your taste at all. For example, we're getting our home ready to sell. We've made many changes that don't suit our tastes at all such as rearranging rooms and painting walls a neutral color because that's what the market in our area demands these days.