Strategies for Consultants

What are some strategies consultants are using for supporting their customers? For example:

  1. Can I develop their skill on my PRO account and then upon payment transfer it to their VF account?

  2. How is security handled? For example, if I have 3 customers as a consultant I would like them to be viewers but only for their project, not my entire workspace. I don’t want to develop the skill in their Workspace because then they have it always before delivery. The only way I can think of is for me to purchase a new pro workspace per customer and charge them the additional cost.

  3. Is there any place to attach things like PDFs/Markdown readme/etc or is that all external in a zip or google drive folder or something.

I guess I would need to just charge them an extra $40 a month to cover an extr