I own 2 domains, and plan to sell them. When I transfer them, does all my info transfer to the person I sell them to (such as credit card numbers?) Anyone who can help me with this, I would appeciate it. I want to transfer my site with none of my billing info/creditcard numbers on.

No. That information is not transferred over, just the domain name is transferred to the new owner.

Just curious, what registering company did you register them with?