hello lee046, welcome to BMWboard.
tire pressure should be on the inside of your drivers side door. BUT since usually when people go to a 17" wheel they go to a 235/40 tire the pressure will be off. try to find a balance between the sport wheel pressure (for the 225/50-16's) and the 17" (the 235/40-17s) i run about 36 in front and 42 in the rear, and i have 235/40-17s.
If you fit eibach springs, be sure to do shocks as well. doing lowereing or sport springs alone with ruin your shocks. The bread and butter shock and spring kit for bmw is H&R springs and Bilstein Shocks.
welcome.