Cutting Cake Can Be Tricky but the picture shown here let you see how to do it.

All you need is a small bowl for the centre of the cake.

Cut around the bowl untill the bottom of the cake (when you feel the cakeboard) 

After that you can make slices and if it's a tall cake you can devide each slice in to more pieces.

Have Fun

White fondant can be dusted gold or painted/sprayed gold with edible colours, but if you want your gold to standout more is best to have your base yellow, So when you add your gold to it you will see that the gold effect is more brighter and you don't have to worry to go back and fort colouring your work.

To know more about how to colour fondant and make your colours to pup out more see the YouTube video of

Artisan Cake Company on how to colour fondant 

https://www.youtube.com/watch?v=Y--hY-GSDo4

Have Fun