Asslam Alaikum Doston!

I am in 1st Year {right from Comming August} & willing to Join Investigation Department or will be Lawyer in Backup if couldn't got Success for What I want to be...
Kiya koi Experienced Member Guide kar sakta hai ki Pakistan Men Investigation Department Join karne ke liye kiya kiya karna parega, I mean Enter ke baad Jab men University Men Jaunga to wahan par Mujhe kon sa Department lena hoga?
Please Do Guide me in Details.................
Thanks.