Which course should I pursue in teaching field after completing M.Com?

If you want to have a career in teaching after M.Com, then you can do B.Ed. or BTC course otherwise, your qualification is sufficient in teaching field and you can teach (private) to B.Com student. Hope it helps.

Clearance of NET/M Phil/Ph.D. Is mandatory at a college level.

If you want to teach in schools, then you are advised to go for B.Ed. If you want to teach in universities or colleges then you are advised to do Ph.D.

If you want to teach in schools then you are advised to go for B.Ed. If you want to teach in universities or colleges then you are advised to do Ph.D.