You can try SpongeForge, which is designed for running plugins and mods at the same time. It's not a perfect emulation of Forge but if you insist on running both at the same time it's your best bet.
So I used the spongeforge and got a server up and running. I took the plugins I had from my other server which are compatible with 1.12, and added them into the "mods" folder of my server folder. I watched a video of how to do this and they said to just put the plugins into the mods folder.
None of my plugins are showing up in the server. What can I do from here?
Thanks.