You should get Angelias quick American cook book.
In a 12" x 17" pan? Don't do it, that will overflow. You can barely bake two boxes per sheet, it's nearly too much. As for the timing for two boxes, it's about 35-45 minutes at 325-350 degrees.
300F convection, 350F normal oven
Yes--just use a sheet cake pan that is the same area as the pans on the box. If it is a larger pan, you may have to do some math.
Well. If you made the half cake from a box then do and estimate for about half the time for a whole cake. I LOVE baking.
Sheetcake pans come in a variety of sizes and depths. What size you want to use depends on the number of servings you want. Also, make sure the pan will fit in your oven. Not all full sheet cake pans fit in all ovens.
You would use a cake pan shaped like a guitar, or bake a large sheet cake, and cut it into shapes then assembled and frosted to look like a guitar.
Cake rhymes with rake and you bake a cake.
You must either have a specialty cake pop pan in which to bake the pops, or you can bake a cake and crumble it up and mix it with frosting and form the mixture in to balls.
The moisture from the ingredients should be enough to bake the cake, you shouldn't need any extra. But yes, you need moisture to bake a cake.
You can bake two batches of cookies at the same time if you have enough cookie sheets and oven space. If you do not have enough space, you can bake half of them, and then bake the second half immediately after.
Using an oven is best recommended to bake a cake