ANSWER:

Yes, he used to offer salutation upon himself as well. 

QUESTION: What did the Prophet ﷺ use to recite before making dua? I heard tht one shuld begin wth sana,then send salutations upon Prophet ﷺ, & then present his/her own supplications. I would like to know what th Prophet ﷺ himself used to say as sana before starting his dua.