I've been doing this all summer with the recipes they have available. It all started with the technical challenge dacquoise I made for my mom for her birthday back in March. It's a ton of fun even though I manage to screw something or another up most of the time. Currently have a large version of Martha's lemon thyme drizzle cakes in the fridge!
Have you watched any of the master class episodes? Those are useful, too.
Also - shout out to cake box mixes. I like making cake from scratch, but box mixes can be super convenient and pretty freaking good. I just follow my father-in-law's tips: mix wet ingredients separately and get them frothy. Then sift the dry cake mix into the wet ingredients. Works like a charm. Nice and fluffy cake.