If Iran has any brains it would use all its stockpile of missiles against the US targets and not waste them against Israel. They need to kill as many American soldier as possible to cause unrest in the US and hope that the government will yield to public pressure and withdraw from the region. Otherwise, Israel will make sure the US bombs Iran every few years.
USA dominates the global media networks. Even if Iran took out a million US troops their media could portray it as a handful being killed. I honestly think everything should be sent to Isreal. If Isreal buckles the USA will buckle. Unline the Americans, Isrealis can't handle causalities.
While all of this is happening the irans should do whatever they can to put the message out their that isreal as much an enemy to iran as it is to the USA.
But truth be told they will send just enough missiles hoping they can come back to "discussions". I also suspect we will see no rhyme nor reason to the iranian missile assualt. It will be a missile here, a missile there but no real strategy. Like they won't focus on destroying isreali air defences and then their air bases. It will be another dumb iranian show.
Iran should be a lesson to Turks as to what happens when your nations turns into a theocratic shithole.