Thank you all, I will keep up to date with what is done, you really helped. I have two questions more, i need your advice.
Now my device - tracker, for me, is simple: a Google map with a pin.
For other people, and I think to make internet service (I'm a web developer, so sites and for me it is not a problem), but my friends say that it is necessary to mobile app.
Questions:
1. What should be in the user's admin panel(user account)?
2. Do i need a mobile app?