A couple of things: If you want to learn meditation find yourself a teacher who will be able to guide you with your specific and personal needs, advantages and deficiencies in focus, character and views on outside world and on yourself, through this process. We are never taught what meditation is and how to do it right. None of the sources mention such important pre-requsite as understanding of human energy movement in breathing, human energy anatomy and physiology. So if you want to play with meditation is one thing, doing thing right will mean you have to have guidance.

Second, As Salvador Dali said: don't be afraid of perfection, you will never reach it. Blank minds is a good but also a very hard and advanced concept beginner meditators will most likely not reach. It is very hard for the uninitiated person (by previous karma or other spiritual training) who is used to focus attention on outward to be able to go inward, let along still the mind. The best way is to distract your mind from 'uncomfortable' nothingness with count while you are doing breathing and visualization.