The number of bashows prior to announcing an engagement varies, as some have many bashows while others have as few as one, which is typical among the children of Hasidic Rebbes.
Bashert (or Beshert), (Yiddish: It is often used to refer to one's divinely foreordained spouse or soulmate, who is called one's "basherte" (female) or "basherter" (male).
Also the age when shidduchim start may vary by community.
In frum circles, especially among Hassidim, eighteen is the age when shidduchim start and shadchanim take notice.
It's expected that the couple keep the shadchan up-to-date on how the shidduch is going at regular intervals.