I would forget about all complex spread strategies! No double calendars, no iron condors, no vertical credit and debit spreads etc.
The only thing I do now is pick a direction, and buy deep in the money calls and puts based on which way I think the market would go. I only trade highly liquid etfs, such as DIA, SPY, QQQ, and sometimes GLD if I like the trade.
Once I get an entry point I try and pick an option that has a delta of 85 or so. and here is the reason... If the trade goes in my favor the delta will quickly increase to 100, so as the trade continues I am getting a $1 for every point it moves in my favor, if the trade moves against me the delta is reduced, so it is not a $1 per point loss, however the theta risk increases. This is also why I pick a high delta option if the trade goes no where and stays in a trading range, then my theta risk is minimal compared to out of the money options, as I have a good bit of intrinsic value in the option I purchased.
The reason I trade options is purely leverage. I can buy 1 contract (100 shares) for $500 to $700, vs $13,900 that I would have tied up if I bought a 100 shares of the DIA right now. So as you can see your money goes a lot further with the same upside potential, with out all the downside risk.
If you are going to trade options, make sure you have a firm understanding of the greeks, and pay close attention to theta, delta, and vega. Understanding how volatility effects option pricing is must for someone that wants to trade options.
Just my 2 cents...