Background planning
First, devise clearly what you want to construct; if you are interested in building a house, apartment, villa, working place (office), commercial or industrial venture, etc. Moreover, is it only the construction work that you want, or require the services of designing, or others, i.e., modern glossy doors, luxurious exterior and interior? Which types of material you want?
Next in the background planning is the selection of the location where you want it to be constructed.