I brainstormed ideas by drawing a rough sketch of my room's layout and taking notation on how i wanted to change it. This process was a good way for me to take note of everything i wanted to do and figure out how i would change things.
Consider uploading photos of cool places and spaces that inspire you. Upload scans of hand sketches showing your first ideas.
Brainstorming ideas is the step where you gather inspiring images of buildings, spaces, colors, materials, furniture, etc. Learn more in this video.