Hello - please see the training material above - making good, or even reasonably decent surfaces from meshes is not, generally, a simple task that someone can just ‘do’ for the asking. Asking for a step by step solution to this compex problem is not reasonable. You’ll need to learn Rhino… no way around it - if you want to reverse engineer meshes. You might look into SubD workflows though, these can be helpful in getting ‘smooth’ objects from meshes. Quadremesh may also help. https://wiki.mcneel.com/rhino/7/tutorial/videos/subd