How do i balance the arm
If you set the slider to zero and set it to play, the arm should have virtually no force on it and kinda float over the disc.
Consider that to be balanced and set the slider to 1-1.2g. If it's not OK and the stylus is clean (take the cart off and check it under magnification), then you probably need a cart.
If the arm isn't near balanced when set @0.0g and it wants to go up, then consider looking up the procedure for balancing it. (if it wants to go up, perhaps adjust the slider until it's balanced, then add 1.2g more to the amount it takes to balance it-that will be good enough to try it)