OMG man!
how the hell do you do 4-8 kg a day in weights that doesnt make any sense. you want to be lifiting a constand weight for sets, and repetitions.

e.g. pick up your 8 kg weight (im guessing ) then lift it up and down 8 times. have a 30 second breather, then do it again. have afinal 30 second breather, and lift that weight till you cant lift it anymore.
each time you lift the weight its called a repitition (or a rep) and each set of 8 repetitions is called a set.

as for shadow boxing, once again you need to learn the correct stance, body placement and punches.
the idea however is to stand infront of a mirror (ideally although no mirror is still good). observing your guard to make sure its good, you start throwing controlled combnations. whenever you throw a punch you check in the mirror to make sure that there arent any gaps left open in your defense, and that its not obvious when you are about to punch.

other than that its hard to help you if you dont know the technique for the punches... you need to go to a gym young man!