Dear Ariful, one of the best reference in molcular microbiology is the book entitled "MOLECULAR MICROBIOLOGY Diagnostic Principles and Practice" SECOND EDITION, ASM press, 2011.  You can follow ASM press books and ASM journals for valuable references in this area. http://journals.asm.org/

Best regards.

Thanks Mr Sudagidan

Kindly look for here too..

https://ocw.mit.edu/courses/biology/

See more resources..

http://www.cellbio.com/education.html

More resources..

https://online.microbiology.ncsu.edu/courses/

Plz check here too..

http://medicine.tufts.edu/Education/Academic-Departments/Basic-Science-Departments/Molecular-Biology-and-microbiology

I suggest you to write it in Youtube and you will find many videos and will help you a lot.

regards