how much time should u need to get better

Time can be very relative, what influences the most is who you play with and find out what your role is

True the mind is a complex place and requires much control and dicipline

Its very different for everyone, it really depends on who you play and how well you can move/aim/track, practice your tracking on the training range bots and try to follow exactly there location with the crosshair

They say that 10.000hours makes you an expert.
so prolly a couple k's?

A lot depends on your starting point, if you are somewhat decent then obviously you will need more training to see noticeable improvements, while if you are complete newb, just after watching couple of guides and playing couple of matches, you will imiditelly see improvements. Learning curve is really vertical at the begining

i think you can becoming good since you reach the 500 hours and after you will be better exponentially