Some help for me.

[LiOneLMeSsIShoT]

I'm going to make a simple inventory system...but idk which things should i use?

can you give me functions...events for it ? or any guid can to lead me to make a simple one?

[Dealman]

Use the MTA Wiki. If you're gonna make it using GUI, look up GUI Functions. If you're gonna draw it with DirectX, look up Drawing Functions.

Then you can store the items via various means, however some sort of SQL Database is probably the best way to do it. For this you can look up SQL Functions(Server side, obviously).

As far as I know, there is no guide on how to create some inventory system. Play around with it, you'll learn best that way. People won't come around serving you with things on a silver platter for free around here :