Help needed with custom weapons, cars, etc. in FiveM Singleplayer

First let me say, I don’t know if this is the right place to ask. If it’s not, please forgive me since I am new to the forum. As stated in the title, how do I install custom weapons, cars, etc. in FiveM Singleplayer? I haven’t found any tutorials on the internet for this, so I have decided to ask it in here.

UPDATE:
I found something on Reddit, it was posted 3 years ago, tried it and it seems to be outdated. https://www.reddit.com/r/FiveM/comments/3h93u8/modding_in_fivem_how_to/

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Bump :smiley:

Anyone know how to do this?

Bump :upside_down_face:

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