What is the best way to get fit, lose belly fat, and tone abs and arms?

My basketball season is beginning soon and I realize ive been really lazy for quite a while. I need to get fit again and at the same time lose belly fat and tone my arms, and abs. If cardio is recommended how long every day should I be doing it for? I am willing to put time into it and im quite determined. I have about 4 months to get back into shape.
Suggestions?