Do merit badges go on something like a white or green sash ? My Son is telling me this. Where can I can go to find out where patches, ranks and merit badges get placed ?

There is a Merit Badge Sash (Green) available at the Scout Shops in either West Chicago or St. Charles. The sash hangs across the body from right shoulder to left hip. Merit Badges are attached to the front of the sash in rows of three starting around the arm pit. 

When a Scout earns a Rank (ie. Scout, Tenderfoot, Second Class, etc.) that patch/badge is attached to the left shirt pocket. Only the most current Rank Badge/patch is worn on the pocket. Some Scouts will attach their old Rank badges to the back of the sash. Other Scouts will attach them to a Scout Blanket which can also be purchased at the Scout Shops. The Boy Scout Blanket is traditionally red. This is what most Scouts will also attach the other patches they acquire to (such as Summer Camp patches, Polar Bear Camp-out patch, old patrol patches if they change patrols or any other miscellaneous patches they may earn, that don't have a place on the uniform).

The inside cover of the Boy Scout Handbook shows the location for placement of badges on the uniform. You can also check out this link 

http://www.boyscouttrail.com/external_frame.asp?goto=/docs/uniform_boy.pdf.