@shadichy If you mean for Legacy Fabric you'll have to go to the Discord for that (where the documentation is and more) https://discord.gg/yBTpRXe where the creators/maintainers can give you the answers your looking for, I don't have any knowledge of how to do that.
If you mean for Forge or other things then this is not the thread for that and even more so I have no idea.
Added 'Cursed Fabric' spoiler at bottom of first post.
Cursed Fabric is a Fabric project for alpha and beta versions (so Fabric is for 1.14+, Legacy Fabric is 1.0 to 1.13.2 and Cursed Fabric is Alpha/Beta).
If you want to try it out you can with this MultiMC Instance (the profile to setup a Beta 1.7.3 Fabric environment) and a few of the available mods, in the first post to the mods currently available on Glass Repo.
I only came across this a few hours ago so I don't know a lot about it yet but I thought I'd share it/include it in this thread as the thread is for older versions that support Fabric so it seemed fitting rather than a new thread/smaller one.