Here goes :you can buy a cake in the supermarket if you are not a baker and if you want any recipes just ask.Take the piped icing off the top of the bought cake to make it flat. Use plenty of icing sugar and roll out fondant icing making it big enough to cover the top of the cake or the whole cake if you want. Wet the original icing with cold water so the new icing will stick to it. Lift it over the cake and smooth on, cut to size, I crimp the edges but you can do marks with a fork or anything. Rub the palm of your hand over the icing to remove excess icing sugar and to smooth it.
I use greaseproof paper to trace a design make sure it's the right size for the cake.
[two upturned mugs and a piece of wood laid across them is good for leaning on so that you don't dent the icing while working on it] Place yout tracing on the cake and using a pen I use one that is empty, go over the drawing and try not to dig in too much, you don't put the ink on to the cake just the indents of the shape. Try to have a light behind the cake so that you can see the shape when you paint it. This is best done asap after icing it as the icing goes hard and will crack when you trace on it. Using a fine paintbrush and food colouring which can be mixed and diluted with drips of water to get the right shade start painting. Always blot the brush before painting as 2 or 3 layers of colour is better than one that is too rich and too wet. If you make a mistake put water on your brush and wet the mistake then put a plain new paper tissue over it to soak up the colour and do it again. Once done DON'T put the cake in the fridge as the colouring goes wet but keep it out of direct light as it will fade a wee bit.
Good luck
Why not try it on just a piece of icing to practice. My 8 year old grand daughter tried it and did really well. The sky is the limit you can do anything! Hope this is OK any questions just ask
Glenda