This is just a small and quick guide on Master Yi. With this you should be able to easy climb from Bronze and up to plat. I have noticed my win-rate getting a lot higher with this build instead of the On-hit build.

Early you want to gank as much as posible to snowball the most. If you dont see any lanes to gank you should just clear the jungle and look to kill the other jungler while clearing all his jungle (Learn to basci attack reset with your "W". It will secure you a lot of kills on ganks and when fighting 1v1. Lategame you wont use it as much because your attackspeed will be higher). About 10-15 min you should try and go for a dragon. Be carefull with ganking toplane because it will allow the other to take the dragon while you're gone.

Mid game you will proceed to completely destroy them and go for objectives. Split-pushing is a good ideer since you should be able to 1v1 almost anyone. Even if they think they're safe under turrets.

When fighting at all stages of the game learn to use Ghost right. You wanna use it about 2 seconds before you reach them because Ghost movementspeed increases over time. Dont use ulti too fast since it might burn out before you even kill someone.
When chasing someone do not engage with Q. You wanna just run at them untill they use flash, dash ect. And alwayse try to dodge their CC spells with Q.

If you see someone out of position PUNISH THEM. Ghost and ulti their *** and completey delete them before their team comes. You can do this to anyone in the game. Even a tank like Malphite with 300 armor or more.

If I start by blue side I clear in this order:
Blue-Frog thingy-Wolfs-Bird ****ers (you can take out the big one quick if you use E)-Red-Golems

If I see a posible gank between my clearing , I run down to try and get a kill as fast as posible. Then proceed to clear jungle. Sometimes I skip the Bird ****ers and go straight to red. And be careful other jungle doesn't wait in bush at red or if he steals it. If you meet the jungler you should look for a fight if your health is ok. Even if he has red already. FULL ALPHA

If I start by red its pretty much same. Kill red, then golems and just all the way through my jungle. Sometimes I just like to counter-jungle before clearing my whole jungle. Whatever you feel like really.