like the guy above said, but first you need to beat the first boss, if you are struggling, its not too hard, one f the corpses has a fire buff, use it at the start of the fight, kill it in it's weak rabbit form, it'll transform. then u do dmg till it has a buff skill you need to do the break skill on it. after that the fight is ez as pie. then u can go to the library and level up.
as a side note leveling is only useful til like lvl 40 ish, ofter that you'll be far enough that bunny will start selling souls, focus on dmg and lose your sanity, then go to the crash room and get ready to farm. i suggest having the storm ruler by now. its in the asylum the walkthroughs can tell you where to get it.