I have had to have floor plans created with nothing to go off of. I drew it out on a piece of paper with the dimensions(bedrooms/etc etc) and gave it to the graphic designer.
I would measure and draw it out myself on graph paper and then upload to Chat GPT to create a professional looking floorplan. Someone on Fiverr could also do this from your drawing. If you’ll be using Matterport for 3D tours, they can create a floorplan. I’ve heard you can upload photos of a room on ChatGPT and it will create a floorplan. I have not tried that.
Find an architecture student and have them blow out some as built for you. Honestly unless you have nothing else to do the barrier to entry for obtaining good software and learning to use it just isn’t worth it.