Yes, you can start with a financial advisor or broker if you'd like, to see your eligibility for a mortgage. But I do hope you have some idea in your mind about where you want to build in the first place. North, south, east...? Sections?
Another way- is to see a construction brokerage; there are a few companies which specializes in this and their main purpose is to be the middle-man, is getting your mortgage together as well as put you in touch with developers, builders and sections which may be available or on the market soon.