Welcome to the forums @justin12! There are many ways to do things in SketchUp, depending on the project, some are faster and easier than others. Before I try and help you out on this, I need some information.
How familiar are you with SketchUp and 3D modeling software in general?
What is the end goal for your project? (3D printing, proof of concept presentation, video game object, class project, etc)
Can you post a picture of what you are trying to model?
Can you post a picture of what you have so far?
I look forward to helping you out in whatever ways I can.