You can check all the details from cfa website
cfainstitute.org/programs/cfaprogram
Exam cost is around $1200 for Level 1, and around $1000 for Level 2. A lot of institutes are available for prep classes charging around 50k to 80k PKR (e.g. SKANS, CFE etc). Four to six months should be enough for each level if you have some background in accounting/finance.