Once you have a kid, life should never go back to the way it was before. You’re a father now, and that kid looks at you like you’re Superman, so don’t be a coward.
Be there. Not only financially, but as a role model. Only paying child support, or only seeing him when it’s convenient, doesn’t make you a dad.
This is a lifelong commitment. Don’t just discipline, but guide him through the hardships of life. Your wisdom will be his foundation.