CAD-like drawing entry will be how quickly?

A few years ago I would learn to basic mechanical drawing, but now forgotten, like the scratch, but I do not know from where to start, there are now computers, sometimes in downloading some of the courses in this field, but the effect is not a good feeling , So now if you want to learn, through what means, the school will do some good?

Xuehai no cliff Repent and be saved more than painting it, and if there will be around, you can ask more, as much faster than reading other people to walk slowly University class, regardless of the