If you can't write the application documents, you need to find an agent, that is, you need to prepare money.
About making things, if you really don't know how to do it, you can draw a picture first, or build a three-dimensional model with three-dimensional software and ask someone to help you do it.
4. The proportion that the invention is transformed into actual goods is very low, because applying for a patent requires a certain amount of financial resources (especially for low-income people), and it takes a lot of energy to make and popularize this thing.