What is some advice I should know prior putting a packet in for Ranger School?

If you are able to commit, "Don't Quit" is the attitude that will get you through, that is if you are physically and mentally able to continue. The pros are that not very many can finish the course, so you would be one of a few, and hopefully learn to be a good leader who can make excellent decisions under very stressful situations. Remember that your objective is to accomplish the mission, but you need to take care of your men to finish the mission. The cons, you will get your butt whipped, but it's worth it.

Master PT test, ruck march, land nav. Buy Ranger Handbook and memorize it.

CPT (Join to see) ?