Hello everyone, I have a question. Are there any rules about where to put the stress in a word? For example the word "Efendim" has a stress on "fen" (eFENdim) but why? I constantly keep stressing every word wrong, please tell me there are some rules! 

You cant speak a language always thinking about where to put the stress on words. Dont try to be perfect. Just speak it. In time you will learn how to pronounce them correctly.

So there aren´t any rules or something? :/

....

There are some rules. You can find some if you google "kelime vurgsu" or "sözcük vurgusu".But my advice to you is dont bother with that.

But everything is on turkish I don´t understand a thing :/

I have the same problem especially when I am listening. Very simple words and sentences sound odd to me.

The ruling about word stress is complicated and somehow useless to master because like gokuyum said you really learn only by communicating. But I will share with you the three four rules I remember and find useful:

1. In general, in Turkish words the word stress is on the last syllable. But if you fail to put it there you are still understood because the pronounciation of letters is the same in stressed and unstressed syllables (cf. Russian).

2. The word stress is always on the syllable that precedes the negation marking MA. This is very handy and helps you to elaborate the verb forms quickly.

                      uyuyámadım

3. The word stress is on the syllable preceding the progressive marking YOR. Unless that particular syllable has the negation marking. In that case rule nr 2 is applied.

                      sevíyorum

                      sévmiyorum

4. Also never place the word stress on suffixes like -le, -ken and the suffixed forms of the verb ´to be´.

Abla you are a linguist maybe this article can attract you

http://www.linguistics.uni-wuerzburg.de/fileadmin/04110230/user_upload/Kabak_CV/THE_PHONOLOGICAL_WORD_AND_STRESS_ASSIGNMENT_IN_TURKISH_KABAK_CV.pdf