Hi guys, wich game i should install for a "complete experience"? I bought the game + all dlcs, but in my library there is Repentance like a "standalone" game. So if i download and install the simple "Rebirth" i will not play with dlcs? I don't understand how it works..

Currently, the game and the DLCs need to be installed in order to get the "full" (all DLCs up to and including Repentance) experience.

The order is:
1. Rebirth (the main game)
2. Afterbirth (the first DLC) (Needs Rebirth installed)
3. Afterbirth+ (Needs Rebirth and Afterbirth installed)
4. Repentance. (Needs Rebirth, Afterbirth and Afterbirth+ installed)

The order can be derived by the info on the pages for each of the DLCs.

So yes, if you only install "Rebirth", you will only have access to the vanilla game, without the DLCs.

From everything that I've read it seems you can totally install all of them. Especially since Repentance rebalances a lot apparently?
I 'beat' the game once through, and decided to install Repentance.

The only reason I see to take it slow is if you're easily overwhelmed by all the shit you find. Although tbh it seems like even the base game could be overwhelming by itself anyways.

My recommendation goes against the majority. I would certainly choose to play just the base game at the beginning, and gradually add expansions, in chronological order of release, because, in my opinion, it's more interesting to see the evolution of content gradually.