for starters Pakistan has existed since 1947. All the other nuclear states have existed for a little longer
Pakistan has actively pursued policies to dominate Afghanistan short of outright territorial annexation.
As far as Pakistan's ability to dominate Central Asia, Iran or West Asia it is a pipe dream given the current piss poor state of Pakistan. For starters Iran can checkmate any aggressive move by Pakistan by allying itself with India. We saw what happened when a local power like Saddam's Iraq tried to gobble up Kuwait.
If Pakistan nuked Iran India still wouldnt do jackshit against Pakistan, Infact 99% of the world would support Pakistan nuking Iran then taking Tehran...90% of the worlds religious conflict from syria, yemen, etc would all be over.
You dont need money to take a country, just will power... the arabs who took over persia are testament to that.