Well if you are going to go postal you need to start thinking big. What would be the most effective way to eliminate the most people in the quickest amount of time? You need to think about these things. The more people who die and the more violently they die will be key in you leaving your legacy. I would start working on a manifesto and post it to the web. Maybe upload a youtube video stating your out right hate for people and life in general. Finally start collecting media email and postal addresses...you will need to send them your final testament. It needs guns and bullets and you murmuring incoherently about nothing in particular. Going nuts and lashing out at society takes work and a commitment on your part. Good luck to you.