Nothing special due to Vista. For firewalls, that depends on the firewall you are using and how it is configured. If, when you start the app server, you get a popup from your firewall saying that java.exe wants to act as a server, let it.
Approx system usage? Depends on your apps. Typically, around 200-400MB.
Also, I hope that this is for development/testing and not production.
Thanks for the quick response Peter.