It depends on your tablet os. Android market support only Android devices (.apk file ), if your tablet has Android os then go to "market" application and choose signup and fill the information and choose ok and click finish.
Now you can able to Download apps, game with Android market.
If your tablet don'* support .apk file it means your tablet doesn'* support Android application, you can'* Download from Android market , your tablet doesn'* have ability to Download games from Android. market.