I've read a good amount of the resource thread and a bunch of other sites as well but I've still got a few questions.

I use to ride a lot when I was in elementary-high school just to get around and whatnot, stopped in college due to lack of a bike and time, and now I'm done and want to ride again. I've never ridden a fixed gear bike or a single speed aside from BMX.

For fixed gear cycling what size should the bike be? I almost got a Giant Bowery in Medium (52cm I believe) but couldn't end up affording it anyways at the time. Would that have been a good bike to make into a fixed gear for a beginner?

Would it be better to buy one on Ebay though even though I don't understand most of the components to know if I'm getting something worth the money? And then returns to the question of size, the medium Bowery if anything felt a tad small to me I like a high seat.

When purchasing what are some things I should look for I've never built a bike and don't really know about frames and all that, I just enjoy riding them.

oh and also I saw LBS in a bunch of threads, whats this mean?