what is youtube partner?
This simply means you earn from your youtube videos.
What does it take to become a partner?
well on those grounds, you have to have good standing- not many copyright issues or youtube videos with spam all over them
How much can i earn?
That depends on your efforts, people earn hundreds of dollars well some only get few cents it depends on your video quality and the message they carry.
Before making any video think of these things
1. What is my video about
2. Is it right for my audience
3. Who is my audience
4. Are people likely to benefit from it
Once you got all these factors you can then apply to become a partner