Like Sam mentioned, buying puts is nearly identical to buying calls with the only difference being that you're betting on the stock price to go down...so if you want to buy a strike that's out of the money, you want to buy one with a strike price LOWER than the current share price, as compared to a call where you'd buy one that's higher. The bid/ask works the same way as with calls and the price fluctuations are similar except you're making money on the share price dropping.
ie.
If "ABCD" was trading at $10.25 currently and you wanted to buy an OTM put on it, you'd probably shoot for a $10 put, whereas if you were buying a call, you'd probably be aiming for a $10.50 call.
Make sense?
“The two most important days in your life are the day you are born and the day you find out why.” —Mark Twain.
