To answer your first question about tutorials...
1. Yes there are tutorials , but they are basics and general AMX Mod X scripting , they won't teach you how to make advanced plugins or specific things.
To answer your second question about includes...
1. For whatever kind of natives you use , you have to use that include at the top , for example ,
set_user_godmode() is the native to give godmode. It is from the
Fun.inc include file in your Scripting Folder. So at the top of a script you would add :
Get the idea? But for general stuff , ALWAYS add :