I have to agree with Matt Kirk. There are a lot of really knowledgeable people on this site and a lot of them are more than willing to try and help you out. The biggest issue we have, when trying to help someone is lack of information. What we would need, to be able to help you out, is the following:
1) Type of plane. Is it a kit build, foamy, ARF, etc? An example of this would be a Kadet Sr ARF. A Kadet is a well known aircraft, the SR is what size, while ARF means it's a plane that required assembling premade finished parts
2) Where are your control surfaces when compared to the wing or tail they are attached to? Are they straight, pointed up or down, rudder left or right?
3) Is the motor what came with the plane or something you had to buy to complete it?
4) Is the plane's motor an electric or does it require liquid fuel
5) Are we correct in assuming you're a beginner with no flight experience? You initial post would lead us to believe that is the case but, as many of us have found out, appearances can be deceiving
With these questions answered, we will be able to help you much more effectively than just guessing at what's actually going on