Mecanim/Animation bug/Problem

Hi all,
I decided to make my own game, but here are my first bugs/ problems i have and i dont know how to fix them.
So i tried to make mecanim animation following this video https://www.youtube.com/watch?v=Xx21y9eJq1U
but i have several problems and i need your help guys.

1.When i press ‘W’ he is straight away running, how can i make so if i press ‘W’ he is walking but when i press Shift he is running.

2.When the animation plays, any , walk back, run, it looks like he is not moving fast enough with the animation [It looks like he is making 2 steps in the same place, i dont know how to describe this so i made a video.]

  1. When i JumpDown the animation plays good but he is rolling under the ground.

Here is the video https://www.youtube.com/watch?v=J8a8lSDT2D4

If you need something [Screenshot of something that may help] Please ask

Thanks for helping!!

Any one can help :frowning: ?