How do i make script so whenever anyone spawns they have a gear in their inventory?

For example: a game where everyone spawns with a gun or tool

This doesn't require scripting. All you have to do is put what you want people to spawn with into the StarterPack.

Just place it in the StarterPack.

This is simple. All you need to do is search for some items in roblox studio and then simply double click it and a window will appear asking if you want to add to the StarterPack. Click yes and you are done. Also this has nothing to do with scripting so you shouldn't be asking. Plus just search the question up on the wiki before you ask the question.