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Hello,
Here are the answers to all of the 4 questions:
https://docs.digitalocean.com/products/billing/manage-cards/
https://docs.digitalocean.com/products/droplets/how-to/transfer-files/
https://docs.digitalocean.com/products/images/snapshots/how-to/change-owners/
https://docs.digitalocean.com/products/networking/firewalls/
Or alternatively, you could use a software firewall like
ufw
for example:https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-with-ufw-on-ubuntu-20-04
Hope that this helps. Regards, Bobby