Until about 15 years ago, Adobe sold an app called Freehand that was supposed to do most of this, but typically didn't work very well. I found it was usually quicker and easier to trace the image by hand in Illustrator. This was long before iPads, of course. Today, Adobe claims its Shapes CC will work on a tablet, but it requires an expensive CC subscription.
I would do this job on a real computer, using a shareware 2D CAD app. Trying to make floorplans on an iPad is bringing a knife to a gunfight.