Is there a normal electronic document management for mere mortals?

Question

Document flow

The documents include both simple fire safety receipts and large orders
Therefore:
1) How to turn paper into files on a computer and transfer them to others so that these documents have "legally correct" (I don’t know exactly how to express it, for example, it was possible to prove in court with this file on the computer, what happened: receipt, signature, etc.), is there such a system?
2) If not, is it possible to do it yourself? It seems that you need to buy an electronic signature, and then what? What else do you need to think about?
3) Is it possible to transfer scans of documents and give them to the case?

Answer 1

For small businesses (mere mortals), such optimization makes everything more expensive. It's cheaper on paper.