Dear leaner,

B.ed is the teaching training ,done before or after pg, which is of 2 years duration it is a retailed corse to get professioncy regarding teaching

The minimum eligibility is you can take after under graduate.

Which takes minimum 2 years and maximum 5 years ,some universities provide ug along with b.ed right after 12th ,

It's better if one acquired both for better teaching job . probably after completion you will able to join in schools , colleges.

All the best.