I make border molds, you can go to my website. There are plenty out there, though, do a google images search for "cake border mold" and a bunch will come up.
As far as the carousel cake, if you're using the Wilton kit it should be pretty easy. Don't you just have to do a round tier and then put the pieces of the carousel on it? It should come with instructions, but I think that part of it will be straightforward.
My wife wants a carousel cake for our son's first birthday (a year away, yes she's a planner). I bought the carousel horse molds. PAF makes a nice one (http://www.bakedeco.com/detail.asp?id=33145&categoryid=0) . I buy most of my border molds from Marvelous Molds as they have a pretty nice selection.
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