starting to trade options

#1
Hi,
I am starting with options trading in a small way and reading literature from all available resources (and from traderji,ofcourse). I have a few questions in my mind,though.
1. Where can I find delta of nifty options?
2. What happens during rollover? What is its significance?
3. Till now, I was thinking only about buying options. But of late, I am getting interested in options selling as a low risk means after reading some enlightening posts in traderji. Please tell me how to go about selling naked put options, what will be the margin requirements and profit/loss scenario citing an example.

Please guide me.

Thanks
 

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