Dear Neelima, to start off you need to have atleast.a Master's in English as your qualification. And then you will be eligible to appear for UGC-NET. And then you will be recruited as an Assistant Professor. With experience, you will become a Professor. Or you can pursue Ph.D in English, publish papers and gain a job as a Professor. According to UGC, the eligibility criteria to become a Professor have been laid as follows:

• An eminent scholar with Ph.D. qualification in the concerned discipline and published work of high quality, actively engaged in research with evidence of published work with a minimum of 10 publications as books and or research policy papers.
• A minimum of ten years of teaching experience in university or college and or experience in  research at the University at National level institutions, industries, including experience of guiding candidates for research at doctoral level.
• Contribution to educational innovation, design of new curricula and courses, and technology  mediated teaching learning process.
• A minimum score as stipulated in the Academic Performance Indicator based Performance Based Appraisal System
• An outstanding professional, with established reputation in the relevant field, who has  made significant contributions to the knowledge in the relevant discipline.