Linux Security

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http://www.linuxquestions.org – I installed Debian 7.1.0 and my question is about securing the os. I have scoured the internet and find a ton of security information, however, it seems to deal mostly with multiple users on that computer. My Debian "box" is 99% going to be me alone on it. I am installing a text-based game (Mud) on it to learn things,(about the Mud and Linux as well) and occasionally my friend may long into the game to test etc..other than that the laptop will not even be connected to the internet. I just want to ensure it is as secure as I can make it when it is online. I know I need to leave telent (HowTos)