Well, I for one, am glad you're here. Welcome to the Forum.
Don't feel guilty for winning. Lots of the most ravenous fans have bought and bribed their way to ARCs, some 12+ have been up for sale on ebay, many selling for over $100 (which, IMO, is a ridiculous sum, but to each his own). As for everyone else... well, that's just the nature of open contests.
Honestly, don't worry about past discussion. They're old and dusty anyway. Feel free to dredge up topic or thread and post anew, or make your own.
All it takes is a first step. I'd challenge you to pick a couple threads at random and make a couple posts. Most of us around here are friendly enough
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A single read through is where most people are. A bare handful have done more than that, and of course you have the lunatic fringe who have gone through several times more than that.
Where to start? Start wherever you're most interested - or make a new topic. Don't feel like you've got to read through everything before you're qualified to post, or some such ridiculousness. Participation is what makes this place interesting. The more, the better.
Nice name, btw. I've only got Crippled God left and I've read through all of Erikson's Malazan. Good stuff.