As I understand it, the only times that stress is needed if Turkish is on the syllabul before the verbal negative suffix.

biliyorum - has no stress
bilmiyorum - is stressed as BILmiyorum

hoşlandı - has no stress
hoşlanmadı - is stress as hoşLANmadı

Turkish has vocal stress at other times but they are not essential to the meaning of the language. Perhaps except for when statements are informally made into questions just by raising the tone towards the end of the statement. However, in this case it is just an informal substitute for using the interrogative particle.

give this example to them, it will maybe useful:

öğretMEnim: i am a teacher
öğretmeNİM: my teacher

kiTAbım: i am a book
kitaBIM: my book

mühenDİsim: i am an engineer
mühendiSİM: my engineer

dokTOrum: i am a doctor
doktoRUM: my doctor

With wave I meant that their voice goes up and down a lot whilst talking

When I read the examples that Bod gave, I realized that I already put hte stress well without knowing the rule. I think if you listen to Turkish a lot, this feeling will come itself.

And I think the examples that Caliptrix gave, made it really clear