I honestly admit that I do not know this distribution, but in most linux it is quite a simple matter - the installer guides you step by step. At the appropriate stage, the installer will propose the appropriate partitioning (the Windows partition will be reduced and the resulting space will be allocated to linux), if everything is ok you include and go further. Nevertheless, I advise you to read the messages carefully (make sure that windows do not fall into space).
If you are completely green in Linux, I advise you to start with some "simple" distribution, eg Linux Mint.
EDIT: I looked at what this kali is and this is a child of a good backtrack
this is not a distribution for beginners, just let it go
