score:4
Let me start with your first question. Zeeburg Park&Ride seems to be located here. I haven't actually been there, but if you look around the area with Street View, you will find a sign telling you that it is indeed Zeeburg P&R.
You can use this online tool to calculate the different routes to get there. It being a Park&Ride, it is just next to a station. The station name is Zuiderzeeweg/Piet Heintunnel.
As @EugenMartynow pointed out in the comments, if you take the route via Amsterdam Centraal, the train ticket will cost you 5.10 Euro (normal ticket price plus 1 Euro surcharge for single-use ticket) plus 2.90 Euro for a one hour ticket for the tram/bus.