IGNOU - Indira Gandhi National Open University

For teaching line you must complete BEd
BEd programme fee structure is concern, a candidate has to pay Lump sum Rs. 20,000/- for the entire programme in the first year and fee should be paid only through a Demand Draft (D.D) drawn in favour of IGNOU payable at the city where your Regional Centre is situated. For example : IGNOU, Regional Centre, Agra 0123456.

These are some good coachings in west Delhi
BELS - English Speaking Course/ IELTS Coaching in uttam nagar
EnglishMate - English Speaking Institute In Janakpur
Kumar Sir for English classes

http://www.ignou.ac.in/ignou/aboutignou/school/soe/programmes/detail/71/2.

Applications are through IGNOU website, register yourself as a new student and then select your regional study center and course, then pay for it.

The foreigner can take the admission for their preferred course through overseas study centers of IGNOU. IGNOU will provide the list of overseas study centers and courses are available in the PDF file. Otherwise, the foreigner can take the admission through any one of the regional centers in India.

Yes, you can.
For BEd you should complete your Bachelor's degree, then you can do B.Ed.