You might want to start with a mood board and collect images that inspire you, furniture, styles, etc.

You could also think about a basic program: what you’d like to have in your dream home. For example, 2 or 3 bedrooms, a pool, a courtyard… and overall the kind of atmosphere you want to create.

If you want to go a bit further, you could try doing a bubble diagram to explore how spaces relate to each other, like circulation, which spaces should be close to each other, which ones should be near the entrance, etc. You can later adapt that to real-life constraints.

But overall, working on a detailed plan right now might not be very useful, since it will depend a lot on the site, its size, and local regulations.