I work for a realestate company and we are trying to use sketch up to create floorplans. Is this the right program and do you know where to find tutorials on how adjust line thickness.

I work for a realestate company and we are trying to learn how to better use sketchup to create floorplans. I see that you are rather knowledgable about the program and was wondering if you having any advice. I have no problem with making the outline but am unaware about line thickness for the scale of the wall. Also was wondering if i could skan my graph paper and draw over it. Any information would be greatly appreciated.