How are call options different from put options and when to use them in markets?

What are the different ways in which I can use options for trading in the markets?

Are options really useful in playing uncertain markets?

Are there any specific risks in selling options; either calls or puts?

How are futures different in concept from options?

I understand that options are risky but can I use options at a time when the markets are literally going nowhere?

What are different pricing models that are used for options valuation?

What happens to the value of the call and put options under Black & Scholes when the dividend yields on the index move down due to a cut in the dividend rates?

What happens to the value of the call and put options under Black & Scholes when the interest rates in the economy move down due to RBI repo rate cut?

I am planning to sell some call and put options. Are there any risks in it?

I am planning to start options trader more as a buyer of calls and puts. Are there some basic things that I must remember?