I would like to go from Chengdu to Leshan by bullet train.Then from Dazu to Chongqin

Which station I have to take in Chengdu? And which in Leshan?When I arrive at Leshan,how can I get to the Boat station to cruise to view the Big Boudha:can I buy the ticket before ,in order not to line to get it?Then I want to see the Boudha by foot.

Which station do I take in Dazu?and which station of arrival in Chongqing?
From the station in Chongqin ,how long does it take to go to the airport:can I take a taxi or a rail or a bus ?I have to take a flight to Kunming .