I have my I.d and recent mail document just don't have my social security card but I know it can I walk in?

Valid ID or DL and proof of current address are the docs they will need. You shouldn't need your ssn card, just the number.

Yes, they don't need to see your social security card. They just need the number

If it's your first time, then yes, you can just walk in. Otherwise you'll need to make an appointment online if you've been to this location before.