I think the only working GPU miner for litecoin right now is Reaper. See this threadhttps://bitcointalk.org/index.php?topic=91979.0
From the very little I know about it, it might be a challenge for a linux newb to get this running.
FYI - you can see from another thread here https://bitcointalk.org/index.php?topic=92887.0
that we are getting a bounty together for a litecoin version of CGminer. If you want to toss in a few BTC for the project, this will help get it rolling that much faster.
This may end up being the most newb friendly option once it is available.