buy a roll of tracing paper and start drawing..........

There are many YouTube tutorials available-try that.

thats not very helpfull! On the mobile app there's a sketch facility where you can 'sketch' a design on the screen! Can't find it on my PC version!

Hi. I have never used it but would think for a floor plan you would choose blueprint, light blueprint, grid, dots, or grey dots from under the CANVASES section. Then you can use the measurement and furniture icons on the left of the screen to design your space. If you find a how-to section let us know.