Arduino twitter display help

Hi,

I'm new to the world of Arduino and need some advice here.

I'm building an Office Door Twitter Display device, consisting of mainly an EtherTen board(similar and compatible with arduino/shields) with build in ethernet shield and a 20 X 4 LCD.

I've got the project up and running and now I can display whatever i want on the LCD.

Problems i encounter now are mainly to do with coding.

I've seen quite a few authorized codes on the forums dealing with projects that are similar to mine. I realized that there are some who utilize different libraries. How do i add libraries on my own? And is there a code template i could start with that will kick start my project?

Appreciate all the help i can get!

cheers