There is no necessity of taking up any face to face training before applying for B.Ed.
Any Engineering graduate can do B.Ed. As you have working experience as a teacher for more than 5 years, you can do BEd through correspondence mode also. There are many institutions offering this course by distance mode. The admissions will be generally based on your rank in the admission test. So get prepared for the entrance test and join B.Ed through the correspondence course. Andhra University, Visakhapatnam. Osmania University, Hyderabad and Venkateswara University, Tirupathi, IGNOU, Delhi are also offering this course through distance mode.
If you want to continue your career as a teacher B.Ed is a must. Without that, you may not eligible to get jobs in government schools as a Teacher and you will not be getting full salary as per scales also. So you should do it as fast as possible.
It is not very difficult to get a seat in BEd through correspondence mode. Please start up and complete it fast.