You have to understand that there are functions for the server, and there are for the client, and there are common ones that work on the client and on the server.
 
	You need to start with the simplest.
 
	https://wiki.multitheftauto.com/wiki/Main_Page
 
	And since you need an entry in meta.xml, study this.
 
	https://wiki.multitheftauto.com/index.php?title=Meta.xml
 
	-- client functions
 
	https://wiki.multitheftauto.com/wiki/Client_Scripting_Functions
 
	-- client events
 
	https://wiki.multitheftauto.com/wiki/Client_Scripting_Events
 
	-- server functions
 
	https://wiki.multitheftauto.com/wiki/Server_Scripting_Functions
 
	-- server events
 
	https://wiki.multitheftauto.com/wiki/Server_Scripting_Events  
	P.S But start writing the simplest scripts, first on the client / server, and then learn how to work simultaneously with the client and server.