Question about MMA.?

You're probably not going to be (or shouldn't even since you're under 18) participating in matches similar to the UFC. Instead, you'd be participating in grappling and sparring matches if and when you choose to. Go for the protection first- mouth guard and cup along with the gloves and shin guards you bought. Those are 14 oz. gloves however, and I would ask your instructor if you should get a 16 oz. instead or not (make sure you get good hand wraps and know how to wrap them). Your shin guards look good but make sure you get so head gear and ab pads later on as you become more advanced. You probably won't need a GI, depending on how your instructors practice. MMA instructors almost always prefer you wear mma gear instead of traditional. The 100 pound bag sounds better and later on you could also get a stronger chain & hook system when you become advanced (eg: standing guard & scarecrow challenge).