I’m doing good in ranked now, where I can win a majority of my games. My question is, how does the gaining 400-500 points a game work. Can I lose one here and there and still get crazy points if I’m winning most of the time? Let me know because I’m curious 
Well it depends o of how you got it.
If you’re a new account playing ranked for the first time or you haven’t played ranked in a while, it will last until you lose 1 or 2 times (if you lose, you’ll still get 400-500 points deducted). After that, it will decrease to 300 and 200 points indefinitely depending on whether you win or lose in subsequent matches.
If you got it bcs you won 10 consecutive games, you’re gonna keep it until you lost a game