I'm doing my school project so I can go to the university and im doing an app that when you request something there will be a list of people who can go to where are you. someone knows how can I do that
To always know where you are: you probably need a Map component and a Location sensor to keep track of where you are
To make a List of people that can know where you are and possibly and information about where they are (their location) so you can create a route from their location (address or geocoordinates)you can use the ActivityStarter (or the Navigate control) to make a map track from where any of the people who are on the List to where that person (YOU possible) are now. This is would be an app to make a route from the people in the list to your current location. 
Is that what you want to do?:
Here are two tutorials that might do show you how to use the App Inventor to make an app that could do something like that.
You probably will need to keep a registry of who offers what in which territory.