If I picked up the game today what are the chances of me being able to compete for millions?
Honestly, you'll be legitimately horrible and basically worthless at this game for the first 3 months. You will not be having fun while everyone else is getting kills and you'll wonder what the attraction is for this game.
Then you'll start to recognize characters, their abilities, their types, their strengths and weaknesses and you will suck slightly less. By now you will have chosen a "main" and you will roll with that character more than others. You won't be completely worthless, but you're still not really very effective. You'll probably stay at this level for another 3-4 months.
Then you'll start to understand what's
really going on, what the objectives really are, the meta game, the synergies, the strategies, etc. You'll be here for about a year, and once you get to the end of this phase is when you'll be actually "competent" at the game.
So after a year and a half, you'll be at a level where you can go into a match and not embarrass yourself. After that, you're probably at six months to a year away from being legitimately "good", and probably another year to reach a "competitive" level.