Linux user prompt

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http://www.unix.com – Hi, I cant seem to get this right. Lets say I have root privileges and I wanted: a ) edit the user prompt to show "linux1234$" whenever they log-in. also b ) Show a message for users upon logging in. I know a) has something to do with editing PS1. but how to only apply the change for users? b ) I know there are or is a file that will enable me to accomplish this, but which or what are they? I'm pretty new to this, so any help or guidance will be appreciated. Thanks in advance... (HowTos)