I don't know much about card games, but, if it were me, I would start doing some googling on how non-digital card games are designed and developed. After that I would create an exaustive rough draft / design document of the card game before finaly making it into a video game.
As for putting the game on facebook: I would worry about actually getting the game done before thinking of something like that, but again, if it were me, I would contact facebook (after having, at least, a prototype of the game) and ask them if they would be interested in adding the game to their website.
In my opinion, I don't think putting your game on facebook is a very wise decision. From what I've seen, facebook has lost a lot of it's hold in the gaming field in the last couple of years. A better idea would be to make it into an app for android or some other mobile device. I'm saying all of this with the idea that you want to make some money with this game, but if your only goal is to make a fun game then go for it