If you just want to practice, finding a language partner is enough. I've met some people here who have been very helpful and still have occasional contact with them through IM or Skype. Unfortunately, because I don't have enough time, and time differences make it inconvenient, I don't get to do this as much as I would like. If you are working through a text book and need help with something, a paid tutor can be helpful. I used to meet with some local Chinese people who were nice enough to help me for free. But after one bad experience, I think it is better to pay someone if I need specific help. I also use a paid on-line service, which provides a regular trained teacher. I cannot expect someone to develop lessons and teach me for free. I suspect I may be in the minority and most people are just looking for a free teacher.