I can help with the cake....... If you take any white cake mix, you can make it lowfat and low sugar by doing the following....

Take the cake mix place it in a bowl, add one can of diet soda (orange works well) and then mix the batter until it is no longer lumpy.
Bake the cake batter as directed on the back of the box... to top the cake you could use fat free cool whip... It is yummy and low in calories and sugar...
If you use orange soda, it kinda tastes like a creamcicle.
Hope this helps!