Answer : Yes. You can use software to design buildings, or you can hire an architect to help you with the design.
Software like Autodesk Revit allows you to create 3D models of your building and render them in different styles. If you want more control over the design, you can also use software like SketchUp, which is free to download.
If you're not comfortable using software, or if you need help with the planning and execution of your project, you can hire an architect to help you out. Architects have training in design and engineering, so they can help make sure your building is safe and meets all local codes and regulations.