Selling Cash Covered Puts

I know almost nothing beyond the basics of Options trading. If there is a security that I would like to own, I understand that selling cash covered puts might be the best way to go about acquiring it because I can collect the premium and the risk is not really more than buying the underlying security, which I wouldn't mind owning anyway. How do I know which strike date and price to buy for my particular security? Is there a formula or a site that walks one through the basics of deciding?

Thank you so much.

To clarify: If I wouldn't mind owning a security, how would I chose to sell the put that would increase my premium and how do I know how to work out what premium I would collect based on the strike price and date?