My advice from one high schooler to another here Bbob, Is if you wanna do a swim bait mold, mold each section seperately and have them sit right side up, this makes ballasting and making vent holes easier and cleaner. Alumalite has a great starter kit but it comes with some unnecessary stuff like instructions cuz I never read those and an excessive amount of clay lol. But I would probably go with the foam to start since it gives you consistent buoyancy and start with one simple bait before you go on to your swimbait to get the feel for how the stuff works (learned that one the hard way)