The house plan can be drawn after going through a series of design stages. Starting from needs analysis, land analysis, design concepts, to design development. After all the stages are completed properly, then a floor plan can be drawn and useful for the development phase.
Actually how to draw a minimalist house plan is no different from other building plans. Each space must be clearly illustrated, along with a comparison of actual size, floor height, description of size, location of door and window openings, placement of structures, furniture, stairs, as well as building materials and vegetation.
Here's how to draw a minimalist house plan and how to read it. At least, you can understand how to draw and read a minimalist house plan.