sorry, me again. 1 more thing...how do i cover the center dowel 'hole' on the top of a stacked fondant cake, with nothing being placed on top (flower, ornament, etc)
Well, you can put a fondant plug over it, but it'll be visible. I suggest figuring out a flower, ornament, flat medallion, etc. that will coordinate with the design.
Rae
You can insert the full-length center dowel into the bottom tier(s) leaving the upper portion of the rod exposed to lower the top tier onto. Make sure the rod is slightly shorter than the entire height so it doesn't poke through the top tier, and don't forget to make the hole in the top cake board in advance so it will be centered.
You can insert the full-length center dowel into the bottom tier(s) leaving the upper portion of the rod exposed to lower the top tier onto. Make sure the rod is slightly shorter than the entire height so it doesn't poke through the top tier, and don't forget to make the hole in the top cake board in advance so it will be centered.
if you've never done the above before, it can be slightly risky.
if you are just doing regular white/ivory fondant...I just use some buttercream for any holes or imperfections and no one can notice the difference after using a hot knife to smooth it out 
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