Decent attempt. Search the web for reference on spaceships and/or mechanical type stuff. Before modeling your spaceship, it would be best to draw it out on paper so you know where to go when you start. When modeling, think if the thing could fly through space, if the design is practical and would actually work in the real world. Also, when texturing spaceships, your best friend is the bump and diffuse channels (if applicable). Add a bump texture map to create panels and small detail, then add the diffuse texture map for damage, grime, and other things you can think of. Keep working on it!