Recently, I've been using helix for a while now, It's pretty good, but for me it's not a 100% replacement (mostly because of markdown) to neovim, in the future helix should get a lot better and should be a good canditate to replace neovim.
In the case of the .vimrc, copy/substitute with your current .vimrc, the plugins folder is the .vim folder, to install the plugins inside of it, run :PlugInstall inside vim, and then, go inside plugins/plugged/YouCompleteMe and run python3 install.py --all (careful, this will warrant 2GB of space for the autocomplete stuff)
For the plugins, simply go to the .vimrc to check that, this repo also has a converted version of the spacedust theme (set background=dark & :colo spacedust), and the PaperColor theme (set background=light & :colo PaperColor).