idlemaster

Just trading cards, no extra cards

Understanding Steam Trading Cards

Go to your badges page. However many cards it says are remaining for each game is the total amount you will get. Unlimited card drops doesn't make any sense.

Once a game drops all its trading cards, that game then becomes eligible to drop booster packs. You have a random chance of earning a booster pack every time someone on Steam crafts a badge, that chance rises with every level you gain.

F2P games generally don't drop trading cards, to earn trading cards for a F2P game, you need to spend money on micro transactions.

every once in a while you may get a pack containing 3 trading cards. Judging by my experience, you get maybe 1 per month for every 500 games or so.