I've precepted quite a few new grads and seasoned med/surg nurses. From my experience, the number 1, most important factor is: attitude.
You sound like you're on the right track and eager to learn. The nurses who can't hack it in the ICU are those who come in and cannot take constructive criticism, especially from a younger, less experienced (time-wise) nurse. If they are not receptive to new ideas and methods they will fail. If they put in no effort outside of work to expand their knowledge they have no business being in the ICU. There have been many nurses who are not extremely smart, BUT they have the attitude and desire to learn... and they are very successful in the ICU.
Be a sponge. Get thick skin. Don't respond with "I know that" or "I was going to do that" or "that's what I was thinking." We want you to succeed, that is our goal.
As far as learning... There's a ton of podcasts I like. Here's 2 to get you started.