There are so many factors surrounding the real estate industry profession!
I think #1 is being educated & continuing education. Just like going to college for a four year degree...
Education never stops!
#2 - you have to be passionate about this industry. It can be very rewarding at times, and extremely difficult the next.
#3 - I think researching and talking with successful, experienced agents is key. Find a mentor and learn as much as you can.
#4 - You can never learn "everything" about this profession as it continuously changes.
Just understand it's a huge investment of time and money to start - but can be so rewarding once you see what a great service industry this is!