where can i find a quest tut that makes a longer quest? i made one thats just talk > kill > get reward, in other words, a more long and advanced one.

Well, not to sound vague, but first you need to figure out what you want out of the quest first. If you want a tutorial on that, you won't find it on the Construction Set wiki. I'm sure there are helpful writing tutorials you can search for.

Once you've found out how you want the quest to progress -- what you want your quest to entail -- then you go about trying to implement it. People here can help with that, but I'm afraid there's no catch-all "make a complex quest" tutorial.

These tutorials from the CS Wiki do include the details of how to create a quest: http://cs.elderscrolls.com/index.php?title=A_beginner%27s_guide,_lesson_1_-_The_Construction_Set_Primer

Extending an existing quest would involve deciding on what extra bits you want, adding the dialogue topics and adding the quest stages. Working through that tutorial will show you how to do all that.