Here's a guide on how to do it
Mods for other stuffs for the game is in the work
Right now, full modding support isn't available, only custom song loading, so you won't have mods like SyncSaber or even ScoreSaber to track your scores online (local leaderboards will have to do for the moment).
The good news is that some extremely smart people are working on it now and those types of mods should only be a matter of time. It's an exciting time that we live in and with the Quest costing on $399 for a full Beat Saber platform, we could easily see the size of our massive community triple as I know SO many people buying one who couldn't afford to get into VR before.
Note: please check back here for updates as the process is being refined. We're working on integration with an app called SideQuest that will allow you to add songs from bsaber.com with just a single button! Stay tuned for that, we'll hopefully be releasing that in the next day or so!