I would suggest the mycadsite.com as one place where you can view multiple tutorials about 3D modeling using AutoCAD. Specifically, the section entitled "Introduction to 3D Crafting." Pay specific attention to Lessons 3-3 (Working in 3 Dimensions), 3-7A (More About Extruding & Lofting) and 3-8 (Revolved Objects - Revsurf and Revolve). Actually, it wouldn't hurt to read through all the lessons from 3-1 through 3-8.
Now I have a have some questions. Are you taking an AutoCAD class? If so, why hasn't your instructor covered 3D modeling? If this is not the case, then who is this project being created for and why?
Here is a link to mycadsite (Note: it is not my personal website).
https://www.mycadsite.com/tutorials/level_3/introduction-to-3d-autocad-3-1.html