Am making a cake for my child's birthday party on Saturday. Have bought a fairly large square cake tin (21cm x 21cm x 7cm) and want to use that, but have no idea what quantities to use. The plan is to bake it tonight, freeze it overnight, and then shape it / decorate it tomorrow night (making a boat - got to cut it into shape and then decorate it with ready to roll icing). Thought it would be easier to handle if it was frozen.
Any advice / suggestions would be gratefully received (have never done this before).
Thank you