How authentic is the Hadith: "Indeed, on the Day of Resurrection, there will be fifty stations; the first station is when people emerge from their graves..."?

This hadith is false and weak. Ibn al-Jawzi narrated it in "Al-Mawdu'at" (Fabricated Hadiths) and said: "It bears signs indicating that it is fabricated and has no basis." Al-Dhahabi mentioned in his summary of "Kitab al-Mawdu'at" that its chain of narration includes accused, unknown, and abandoned narrators. Al-Iraqi, in his "Takhrij Ahadith al-Ihya," described it as containing wonders and having a dark chain of narration.