Teacher

Well, firstly you need to decide in which college you wish to take admission and check the criteria for selection. Usually 50% and above is considered. You will have to apply for National Eligibility Test. The National Eligibility Test is to be taken in the subject in which you have expertise and have pursued your Masters Degree program.

Yes, you can work as a professor after completing your PG and Ph.D. You need to verify the employer's requirement before applying.

You need to do it abroad. In the US, there are various centres which conduct such courses online.

It would be good if you do Masters in English Literature and later on a doctorate in same. It will help you to work at the university level. For this, you need to clear UGC Net too.

Please do M.Com first, and then B.Ed to become a teacher.

Go for M.Ed. You can go for Ph.D and give NET exam.

The age criteria for physically disabled is 35 to 40. Yes please try in government agencies. You should get some age relaxations keeping disability in mind.