LairdsClub Australia

Hello all, Am new to this, please be patient. I am trying to develop a simple floor plan for a 4 metre X 4.5 Metre studio apartment. I cant work out how to change the scale down to something I can actually see on the screen. I have modified and saved as. One of the templates. Its the size of my thumb on the screen and I cant seem to measure the walls length or width. Try as I might!! Ive had a look at the tutorial and it does not seem to address this other than tell you how to move the camera around. Please assist. David