The Sample_ styles.dwg, provided with AutoCAD Civil 3D, can be used to preview Standard AutoCAD Civil 3D styles and note the differences between them. This drawing demonstrates how styles can be managed and the various ways in which styles can be transferred to other drawings. Review Sample_ styles.dwg and see which styles you might want to change at the outset.
Sample_styles.dwg is available in the Civil Best Practices Guide folder in the AutoCAD Civil 3D installation, for example, C:\Program Files\AutoCAD 2015\C3D\Help\Civil Best Practices Guide.