What size sheet would a floor plan of 1/4"=1’ need to placed on? And what site can i download sheets from?
You need to see what sheet fits your plan best. Use the ones in revit under the libraries>titleblock category
24" x 36" is most popular for regular architectural floor plans.
If it’s a smaller plan you could use 11" x 17" or 17" x 22"…
Some architects would rather put 2 floor plans and stick to the regular 24" x 36"