In this file you can download ready block for your projects.
In attached file you can find Autocad blocks
Stairs nodes in Autocad
If you can't or don't want draw then you can use one of the ready objects.
Here you can download Autocad line types
In donwloaded file you can find
AutoCAD line types to indicate the factory and assembly seams
AutoCAD line types to indicate weld
AutoCAD line types to indicate topographic plans
AutoCAD line types for different areas