Q:

If a moving charge itself makes magnetic field, then how can we study about force on a moving charge in Magnetic field?

If a moving charge itself makes magnetic field, then how can we study about force on a moving charge in Magnetic field 
Isn't it a contradictory statement?

A:

You may be confusing the magnetic field of the moving charge and the external magnetic field.
Let's say, the external magnatic field B2 is caused by a steady electrical current in a straight wire. And the charge is just standing next to it. There will be no force on the charge or the wire.
Now when the charge gets moving relative to the wire, it also creates it's own magnetic field B1.
B1 has nothing to do with force acting on the charge itself. B1 only exerts a force on the wire in which a current is.
The magnetic force acting on the charge is only due to the magnetic field of the wire (B2) and the speed and direction of the charge.
Nevertheless, the force exerted to the wire by the magnetic field (B1) of the charge and the force exerted on the moving charge by the magnetic field (B2) of the wire must be equal.
You could take a look at this video which explains magnetic forces in terms of special relativity just to have a simple idea about contractions and transformations:
https://www.youtube.com/watch?v=1TKSfAkWWN0
You got confused about the magnetism and it's a sign that you are on the right path. Good luck with your studies.

