I double wrap in plastic wrap and then put them in a freezer bag with as much air taken out as possible. I also put them on a cake board after they are wrapped in plastic before I put them in the freezer bag so they don't get misshaped before they manage to freeze. I did this for my cousins wedding cake where the wedding was in Mexico, but the reception was here at home and I only had a couple of days to get the cake decorated. It worked really well.
I wouldn't fill or dirty ice them until after they are defrosted.
I rarely freeze cake but for the few that I have, I filled & crumbcoated first. I was using BC between the layers so I wasn't worried about weird freezer effects on the filling. I had them on their cake boards and then used several layers of Pess & Seal Wrap and then either a plastic bag for the small cakes or layers of foil for the larger ones.
I moved them to the fridge for a while and then to the counter to defrost before I did the final frosting/decorating and everything came out fine.
HTH
Kristy
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