I need some help with Automator.

Simple, just set up a rule in mail.app to look for that keyword and then set it to copy the message and then run the automator script. For the automator script just add a launch safari command, then click record and it'll automatically turn all your moves into an automator script. So hit record, do what you want to be done by the script, then hit stop. Now make this the script that the mail.app rule launches and you're done. Here's an important tip, when you record your automator moves, do everything using key commands and no mouse moves. Automator is able to record mouse moves too, but that gets ruined if any of the on screen controls later aren't where they were when you made the script.