I have to do a cake just like this (a few decorative changes) and I have no idea what I need to buy or where to get what I need? I am unsure what is used to raise the tiers high enough for the florist to insert the flowers. Also, what size combinations is this cake supposed to be done in? Can it be done in 6", 8", 10", 12" and 14" intervals? Thanks so much!!

can not see the cake, sorry!

All the supplies you need can be gotten from your local cake shop. If they don't have the ribbon Wally world or Michaels will have it. The sizes are perfect and your cake shop should have pillars to make your seperations needed for the flowers. Oh and your cake boards should be an inch bigger than the cake size.
hth