How to build a site with a map that shows where people offer and need help?

I'm trying to build a site where people can ask and offer help to each other. The idea is that people could publish "help needed" and "help offered" posts by filling in a simple form (with address data etc.). The posts would then be displayed on Google maps. This way it would be easy to find people that are in need of help as well as those that are available to help.

I'm novice with WP, so I'd need some tips, what would be the best tools to use to do the following: - Create the forms (one for help requests, one for help offers) - Show the filled in forms on Google maps? - Create sing-in for the service (I want to have people sign-in before they are able to post. This is to reduce misconduct.)

I'm trying to set up this service to support those that need help because of corona outbreak.

Thanks, Juhana