Dein, welcome to the forum first off.
I have also once asked the same question when I joined.
I do have muliple answers/questions.

Here are the questions,
Have you been keeping a dream journal?
Have you been keeping up with at least 2 reality checks?
Would you rate your dreams vivid from a scale of 1-5?
Do you have any time worth of sleep to sacrifice?

If the answer is yes to most or all of the questions above, I suggest you try the easiest and most popular method on the forum. It is called a MILD.

Mneumonic Induced Lucid Dream, is what the acronym stands for. A breif overview of this method is: You wake up after you had a dream, or at least 4-5 hours after you sleep, and try to recall your dream. If you are able to remember your dream, then try to think of some dream sign. Dream signs could be anything, for example, if you saw a purple cat in your room in your dream, you would know that you were dreaming. Thus, while going back to sleep tell yourself that you will recognize some kind of dream sign and therefore become lucid.

Another method, requires little work. It is called the DILD. It is the Dream Induced Lucid Dream, in which you recognize you are dreaming from either a dream sign, or a reality check within your dreams. If you form a habit of doing reality checks (takes about 3-4 weeks) by doing at least 2 reality checks a day, you should do them in your dream and result in becoming lucid. This is the most frequent type of LD, and usually is the one that is most common.

There are many other methods, but I suggest you stick with these not to get confused. After you are comfortable with these techniques, and so forth, you may explore the tutorial sections here: http://dreamviews.com/community/forumdisplay.php?f=25For more info/ methods.

Also, if you are interested there is an academy for dreaming, which you can attend to learn more, and progress further into LDing.
You can apply here: http://dreamviews.com/community/showthread.php?t=93951


Sorry for the great wall of text. Good Luck!

Hope this helped a bit,
If you have a separate question don't hesitate to drop by chat, or send me a PM,

Welcome Aboard,
-ClearView