Treat carbon steel pans the exact same way you would treat cast iron...wash/dry/season/cook/coo/cook/and never (ever) wash with soap.
It has very similar cooking charateristics to cast iron. Slightly less weight.
Handles tend to be very (!) long compared to the same size cast iron pan.
I have four debuyer steel pans, from 8" to 14" (which just barely fits inside my oven, again the extra long handles). Best place to buy is jbprince.com
JB Prince - The World's Finest Chefs' Tools & Equipment
Best brand is debuyer. They make 3 grades of steel pans. The link above takes you to the thickest grade available. I feel these are the best money can buy. On the jbprince website any of the pans with item numbers 320 xx are debuyer pans even though they dont state that. Dont get cheap, thin, pans, they are no good. I have them, use them, and will never ever part with them. Best of luck