1. sometimes there is some gambler selling cheap COTAI JET ticket, $80 to $100, 遇唔遇到就depends on your luck la. (Cotai Jet is operated by venetian and the final destination is in Taipa, but you can take the shuttle bus of different hotels to bring you to the center of macau, and the shuttle bus is free)
2. I think you don't need to buy the ticket in advance.
3. Not so understand what you are asking.........from zhuhai to ferry terminal, the cheapest way is to take bus, u can check the below websites for details. It's not too far away.
http://macaubusinfo.bizhat.com/busroute.htm
http://www.i-busnet.com/macau/busroute/
4. 位於"三盞燈",有"園林","雅香"&"牛仔屋"
5. You have to tell me which places you want to visit so that i can plan the route for you to avoid wasting time.