This is covered in the faq:
- http://askubuntu.com/faq#howtoaskhttps://askubuntu.com/faq#howtoask
- http://askubuntu.com/questions/how-to-askhttps://askubuntu.com/questions/how-to-ask
These are both linked in the same page you ask a question (look on the right, by the formatting help, etc.) I've also made some videos to help:
