Want Visio diagrams for home ductwork idea

I want to expand my Air Conditioning (HVAC) and have identified a few parts wanted. I'd like to pencil out what I want and have a Visio expert draw out so that I can obtain quotes/bids for building out. I'd provide pencil drawing, and links to the part #'s on the distributor website. Would like a long-term hourly relationship with a pro as once I do my own home, I want to sell the systems so will need a design for each home. Start with just my home. Ideal would be someone US based (I'm in California) with whom I could work on a very small 1st project to see what is involved and cost.