A good way to find an architect is the same way you would find any professional- through a referral from a friend or family member. If someone you know and trust can recommend an architect from their direct experience, that’s a great place to start.
Two-story construction is cheaper than one-story. Two of the most expensive parts of a house are the roof and the foundation. A two-story home with the same square footage as a one-story has half the roofing costs and half the foundation costs. There are also economies in plumbing and heating in two stories.