Hey,
Are you sure to talking about mods ? Not plugins ? That’s 2 different things ?
If you are talking about plugins ,i would be glad to help you , just add my discord: Null_#9543
See you 
But if youre talking about mods , you can find several videos on youtube, i’ll link some of the best ones: How To Make A Modded Minecraft Server in Minecraft 1.14.4 (Make A 1.14.4 Forge Server!) - YouTube or How To Add Mods To A Minecraft 1.14 Server (Install Mods on A Minecraft Server!) - YouTube
This guy makes me laught each time i see him , he explain pretty well tho
Have a nice day my dude.
And just for the info, make sure to read this thread, it’s very important for the future of Box To Play: https://forum.boxtoplay.com/t/mais-que-se-passe-t-il-whats-happening-annonce-importante-important-announce/20179