Setting up a batch of tablets

I've been asked to help set up 10 (Lenovo M11) tablets for a small charity to be used by elderly people in the neighbourhood. I suspect the end users won't have the skills to set up the tablets from scratch, so I'm going to do it. I'm wondering whether there's a methodology for doing this efficiently, and I've got a couple of questions...

  1. Can I use a single common Gmail account across all the tablets?
  2. Is it possible to disable the option to add a debit card to the common Google account to stop the users accidentally adding one, and other users potentially charging things to it?
  3. Is it possible to set up a standard deployment of apps, or is the process sufficiently complicated that it's actuallyt not worth it for the number of tablets?
  4. There's a risk a user might try to reset the main account password. Is there any way around this?

Thanks in advance,

Trent