How to set up dynamic Google api maps on a website?

Question

Google Maps

Good day to all.
The question is. There is a portal where companies open their accounts. So, it is necessary to embed the function of choosing the location of the company on the site and that this data be saved and published in the user's account.
Please tell me in more detail how to do this?
The portal itself was developed in Asp.Net MVC 4.
Thanks for the help ;)