Loving my time here

Just bought a yr 2000 zxr250... rides like a dream..
i was looking to get some slip on aftermarket exhaust for it...
does anyone know a cheaper place to get them... its hard to find aftermarket exhausts for this particular model even on ebay... i am wonering if exhausts from other models will fit it???
My other Qustion was: how can i change the coolant oil.... like i dn't know which bolt to open to drain the old fluid out of my engine and radiator... I would greatly appreciate your responses

Feel free to share any general advice about lifestyle of motorcycling...