B.Ed

Hello,
After completing your M.Sc, if you want to pursue your career as a lecturer, then you have to prepare for CSIR NET exam. It is conducted for science candidates, who want to make their career in professorship or research field.
After clearing this exam, you will have many career opportunities available. So, you can start preapring for NET exam to work in government colleges.
Best of luck.

To do B.Ed. the minimum cost may be anywhere between 40-60 in regular colleges. Correspondence course is not valid at least in Maharashtra. If you are residing out of Maharashtra then you can try to do it from IGNOU through correspondence.

It depends on your Bachelor's degree. Teaching subjects can be taken on the basis of what you have studied in the qualifying exam.

Admission to B.Ed degree course is tough because of high competition for limited seats but the course is not tough if you are good and serious in your studies.

BBA graduates are eligible for B.Ed degree course as eligibility criteria for B.Ed is minimum graduation degree from a recognized university.

Both are good and depending on your interest you may choose one. MBA in HR is good if you like managing people and B.Ed is good if you like teaching.