How do I create "mini" (6"?) individual cakes from a sheet cake for a bridal shower?

Is 6" a good size? I would like to do 6" rounds. I will definitely go by your recommendations. I will be crumb coating the ind. cakes and then covering in fondant. I did not want to do cupcake or pops b/c I wanted to be able to decorate in the theme of the shower, and felt that the rounds would better suit our needs. I tried desperately to find a PAN with actual INDIVIDUAL wells that would suit my needs. I need one that has straight sides. I ordered one b/c in the description, it stated that it had straight sides, so I thought, "Great!, it's not a cupcake pan!" When it came in, guess what? Slanted sides....it was just a glorified cupcake pan. If I could find a pan, I wouldn't have to go to the trouble of cutting, although, cutting the ind. rounds IS cheaper!

Should I first freeze the cake and then cut the rounds straight from the pan, or after freezing, move the cake to a cooling rack and cut the rounds?
Also, does anyone know of any sources for decorating the type of individual cakes or projects for individual cakes that I am speaking of? Each time I try a search, I get cupcakes and cake pops, which I do NOT want, in this case! I thought that some of you might know of some sources! I will be eagerly waiting.

If you have any other suggestions for me, I will gladly take them as I am new to cake decorating (as if that were not obvious!)
Thank you for your time and your knowledge!
God bless.