From one's local craft store they can easily purchase all of the equipment that is required for a building a miniature doll house, including, but not limited to, things such as furniture and parts of the home.
One would surely need to make the house, as well as the furniture on their own so that there is no way that this porject can be prolonged, whatsoever.
Everything needs to planned out on paper before proceeding to the other steps, because sometimes planning and budgeting are just as, or even more important that the project itself.
Link: Creating the Main Structure of Your Miniature House