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Which OS to use? How to verify that the OS is secure?
How to download and install Electrum securely? There are many methods - binaries, git, homebrew, Ubuntu package, building from source.
Is there a tutorial that has step by step instructions on how to set up a secure environment for Electrum and use it securely?
http://bitcoin.stackexchange.com/questions/8214/what-are-the-security-considerations-for-hosting-your-own-electrum-server says since there is no private information they couldn't do much if it was insecure. – James Snell – 2013-11-24T17:41:03.333
Also if security is your aim then Ubuntu (and Linux in general) is a bad choice as they aren't particularly secure compared to proper Unix (like a Solaris or a BSD derivative.) If you must use Linux then you should look to a hardened version like RHEL or CentOS. – James Snell – 2013-11-24T17:45:47.407