[your name] M. Ed.
You just sign your name as you always have. Any honorifics are not necessary in a signature.
It is most likely M.Ed.
You put MA or MS depending on the degree.
It depends on where you obtained the degree, the specific school, the specific program, and what the school indicated the degree type was. While their are common degree types, they may vary according to country and institution.
Unlike a doctor or lawyer, holders of a master's degree (in the U.S.) do not typically place any sort of title in their daily name. That is, there is no masters equivalent to Dr. or Esq.
It really depends on the countries educational system, and the specific school the degree was obtained from.
No matter where you went to school, the degree is the same: your name, MA.Ed
It depends on the school you graduated from, and the specific program of study. For example, a masters in education could be an MA, or MEd, etc. Thus, John Smith M.A. or John Smith MEd.
How would you write masterf of Education? Is it: M.S. Ed, or MSD, or M.S. Ed
D. Min. signature