To open a Taobao store that provides CAD services, you need to be familiar with the standards of mechanical drawing or architectural drawing, and be able to draw complete drawings.

You need to be able to draw complete drawings (there are many available for download online) and reach the level of a senior draftsman.

Prepare CAD template files by yourself and use different print settings for different situations.

You cannot meet the requirements for opening a store without passing the actual test.

If you feel that you have learned enough, you can try to find a job in a drawing and printing store.