Train and Cost to go from HKG airport to Tsuen Wan

Do you go from Tsung Chung to Lai King, change train to reach Tsuen Wan?
Do I buy separate tickets for each leg of MTR?
Is there a bus service from the international airport to Tsung Chung station?

Is it better to take Airport Express to Tsing Yi; change train and go to Lei King; change train to Tsuen Wan?

Thanks
TVG