Done :-) Now you just start trading cards on the built-in market?

I'd like to unterstand how that all works under the hood - obviously you don't need to answer these questions, but just in case:

• How do you prove possession of a card?
• Where else than the official market can you trade cards?
• Is there some kind of a trade history?
• How much liquidity is there in the market?
  etc.

Apart from that - do you know a good beginners guide for Steem Monsters?