There are four main entry points for ligthning.
Radio antennas
AC main power
Telco
CATV/Satellite

http://www.polyphaser.com/ppc_ptd_home.aspx
Is a good place to start.

Good protection won't be cheap. And according to some
who live in FL, the strikes there are intense enough to
defeat even good protection.

I have survived on direct strick that vaporised coax and
antenna, and several near by strikes that took out nearby
trees with no damage.

Good protection will also require a good, low resistance
ground. Not a casual project.

Terry

I use a Brickwall surge filter,model 8R15 www.pricewheeler.com
www.brickwall.com For my computer,I use an APC model 1000 battery
back up. www.apc.com Your phone company can add a lightning strike
protector where your phone line enters your home or building,there might
be a monthly charge added to your phone bill for that.
cuhulin