Hey, Names Alex. I could really use some assistance getting adjusted to this. I’m very VERY new to modding. Don’t know anything about it, but do know that it looks like fun 
I mostly want to mod GTA5, Halo, and Minecraft. Any advice, I’ll be glad to hear it! Dont be shy and say hey!
Welcome to the site Alex!
To start off you can download Horizon here:
https://www.horizonmb.com/client/v2/latest.php
Also be sure to check out the Horizon Tutorials section here: