I guess what an option writer looks for are resistance and support zones, writing calls at resistance and puts at support. How you determine this resistance zone depends on what you like to analyze the market. Yeah, technical analysis is a good way to determine these levels.
Thanks for putting the tags correctly 
thanks for guiding me sir
how to find out what is the resistance and support level of nifty?
Nishant, most of your question seems like you want to learn everything immediately. The answers to these are quite descriptive Check this on support and resistance using TA: http://zerodha.com/varsity/chapter/support-resistance/