Editing Collaborative Documents
Monday recently release the beta for this tool. See community post for more info and how to activate it on your account: Monday Docs is here!. Also you can check out more info here: https://support.monday.com/hc/en-us/articles/360021702939
I believe there is also and app in the Marketplace that offers this but I haven’t used it yet.
Generating Documents(PDFs/Word Docs) and Sharing/Sending
There are many ways to accomplish this. All of which will require some form of third party app, custom integration(Integromat/Zapier), API knowledge, or custom application building.
I would start by checking out the Marketplace as there are multiple solutions there currently. Another option is creating a detailed post in the Hire an Expert - monday Community Forum section if you want to go the custom integration or application route.
Good luck!