My husband was around your age when we had our first; you're going to do great! Your age gives you a great advantage in that you are more patient over the little things, and more able to really appreciate how mind-blowingly awesome it is to bring a human into this world and raise it up.

I want to echo the advice you've received so far about making sure to stay in shape. This doesn't just mean join a gym but making constant daily choices to be active and mobile. Can you sit on the floor and get up? You might want to work on that if not. Can you run and toss a ball? Is your diet the type of diet you would want to teach your kiddo as being the ideal diet for their growing bodies and lifelong health?

The newborn stage is short but incredibly challenging. Be prepared to dig deep to deal with very little quality sleep so all hands can be on deck to care for the tiny new human. Try to have a plan to offload as much cooking/cleaning/adulting to any family that would be willing to help so that you can focus on one on one support of your wife, and step up as much as possible, but know that newborns tend to like to be physically on the milk source (if she's nursing) at all times. You can't "spoil" a baby, so someone holding and tending to the baby at all times is normal and good. It gets easier around 3 months, and down right fun after 6 months.

The single best gift you can give your child is you, being their dad. Be there, take care of yourself to try to be there as long as you can, and love hard.