With my first code, the amblance radioed in and I remember thinking "Someone should call the ER... Ahh, I'm the ER!"
I was terrified. But I lived through it, no pun intended.
There are some codes you will look back on and see that you were there at the right time and did everything like clockwork. Others you can look back on and wonder what just happened. It just depends on your team.
Even if you don't get a lot of codes, ACLS or the like might be good for you to take.
Just remember that no matter how many codes you're in sometimes your hands will shake, you'll have to remind yourself to breathe, and it will seem like complete chaos. My advice is take a deep breath (quickly), focus on the ABC's, and know that the chaos will clear.