Welcome to the sickness maxfit, if you would like to start off with something simple, a straight limb longbow is the easiest. A nice straight 2x6 and you have your 'mold', you dont need a hot box necessarily, most anything with some reflex/deflex (curve), and you will be spending some time on the mold, getting the curves even on both sides, making sure they are square and such.
If its a project with the kids, their age will usually determine their attention span, sure does with mine anyway.
Bingham is a good place to start, they have videos which will walk you through the process.