1. What salary do you get while in Pakistan?

...same as BPS-17 officers of all services around 14,000 i suppose with 9500 as basic pay

2. After initial training you are posted in Ministry of Foreign Affairs for how long and when do you embark on your first diplomatic mission?

....Depends on if u clear FPOE in first attemp..if u do so u get 10-12 months before going to language training, after which u have to return and then after some time u are posted abroad... can take 2-3 years

3. Are there any courses you have to undergo for future career progression or
how do you progress?
yes...same as other services like MCMC, Staff College, SMC etc...

4. Is Ambassador senior most? what comes next
...outside Pakistan...yes...ambassador is senior most appointment