Activating Accounts of Imported Users

1. User account details have successfully been imported to WP. BUT, how can users then be told what their username and password for the site is, if they’ve never logged in before?

(For every individual user account, I could click ‘Generate password’, but instead that sends them an email telling them that their ‘request for a password change‘ has been acknowledged’, and invites them to visit the website to update a password they had never received in the first place.)

2. How do I email all imported users in one go, with an email showing their username and password, and inviting them to log in for the first time at the site? I see the ‘Email templates (Import Users) plugin in the dashboard, and this is great to use, but contains no way to actually send the email template made. Where do I do that?

3. Once they have logged in, if a User is a standard WP Subscriber, then how can I enable a Subscriber role user to see a front-end registration form displaying their own CSV-uploaded details only, to update if they wish? I have such a registration form set up, but it only seems to be usable by new registrants and not by he users whose details (username etc.) have already been uploaded.

Would be grateful for any pointers. Thanks guys! ??