I was that way for about 8 months -- I've been a member of Less Wrong since it was turned on, but almost all of my karma has been acquired in 2010.
I had a lot of free time and so I jumped in by replying to comments on the recent comments page. My tips for doing it successfully are to look for comments where you can add a small point of additional information, or have a minor disagreement with a point of the comment. In order to make sure you don't lose karma for doing this, couch your words in linguistic uncertainty, using phrases like "I think".
You sound a little too confident when you say "In order." Oughtn't you hedge that statement?? :)
And hi.
Some research says that lurkers make up over 90% of online groups. I suspect that Less Wrong has an even higher percentage of lurkers than other online communities.
Please post a comment in this thread saying "Hi." You can say more if you want, but just posting "Hi" is good for a guaranteed free point of karma.
Also see the introduction thread.