Just a short list of the core YAML mod family to get new players started with no issues and can build from there.
YAML is modular by design and is not required to use the entire collection.
(Do PAY ATTENTION to dependencies however as some of these do have them.)
No load order changes are necessary and will work right out of the box once subscribed and activated. There are a few listed conflicts but are not actual 'conflicts' as such but necessary overrides for compatibility. MW5's mod manager cannot tell the difference and just detects that files are being overridden thus lists them as a conflict. This is fine for all listed mods here, ignore it.

There is also an alternate develoment branch with YAML from LittleTex.
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3125400065 (READ CAREFULLY on this one as it replaces YAW and YAWC, do not use both. ( Also REMOVE both of the addon/fixes mods by Deadraiser if take this path. )

Curated collections if looking for more modding options:
My full collection: ( Mixed nexus/workshop )
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=2882442766
Phfor's coop collection: ( If prefer a nexus only collection and a stable coop base. )
https://next.nexusmods.com/mechwarrior5mercenaries/collections/ecvzyl?tab=mods (requires vortex)

If you use Discord feel free to join the community:
https://discord.gg/yetanothermw5server