[PLUG] Wireless home LAN - security? WiFi vs Bluetooth?

[Richard Owlett]

Sneakernet for file transfer has become annoying.
Ethernet is not feasible.
I have only a few machines a max of 6' apart.
My usage would typically be peer-to-peer but I want to communicate 
between any two machines.
My web connectivity is via a T-Mobile WiFi Hotspot (WiFi turned off).
I run Debian and all software must be in their repository.

I've just begun reading - primarily Wikipedia articles and some links 
from them.  My primary question is "What should I be reading?" in order 
to ask appropriate questions.

A significant concern is security issues. Bluetooth, being short range, 
may thus have an advantage. Speed is likely not an issue for my expected 
usage. (I was one of my ISP's last 6 dial-up clients ;)

TIA