I'm a beginner who needs to meditate on various things that are causing nocturnal emissions; etc. I'm okay at pranayama; but, I have no idea how to meditate; much less meditate on any particular subject. How would I go about a simple meditation that would be a good technique for a beginner? I have no idea how to meditate on any particular subject. What books would help me? I know those are quite a few questions; but, I'm sure somebody can help.