In order to prepare ourselves before meeting with Al-Mahdi (The Guided One) and fighting against Al-Masih Ad-Dajjal (The Impostor Christ), we have to be able to estimate the arriaval of them. One way to estimate their arrival is to look at the fulfillment of the minor signs of the Last Hour because if all of the minor signs have been fulfilled (excl. arrival of Al-Mahdi) then Muslims are supposed to be strong enough to unite and stand alongside Al-Mahdi to fight against Ad-Dajjal and his minions. So how much percentage of the minor signs has been fulfilled (estimation is OK)?

someone told Me that prophet Mohammed Nabi(A) is lay down in qaber for 1500 years and then the wold ends.Is there any proof for this?up to this how much year after prophets is dead?

The translator has chosen ruler for word hakam. Is this correct? حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا سُفْيَانُ، حَدَّثَنَا الزُّهْرِيُّ، قَالَ أَخْبَرَنِي سَعِيدُ بْنُ الْمُسَيَّبِ، سَمِعَ أَبَا هُرَيْرَةَ ـ رضى الله عنه ـ عَنْ رَسُولِ اللَّهِ صلى الله عليه وسلم قَالَ ‏ "‏ لاَ تَقُومُ السَّاعَةُ حَتَّى يَنْزِلَ فِيكُمُ ابْنُ مَرْيَمَ حَكَمًا مُقْسِطًا، فَيَكْسِرَ الصَّلِيبَ، وَيَقْتُلَ الْخِنْزِيرَ، وَيَضَعَ الْجِزْيَةَ، وَيَفِيضَ الْمَالُ حَتَّى لاَ يَقْبَلَهُ أَحَدٌ ‏"‏‏.‏ Narrated Abu Huraira: Allah's Messenger (ﷺ) said, "The Hour will not be established until the son of Mary (i.e. Jesus) descends amongst you as a just ruler, he will break the cross, kill the pigs, and abolish the Jizya tax. Money will be in abundance so that nobody will accept it (as charitable gifts). Sahih al-Bukhari 2476 https://sunnah.com/bukhari:2476 . Two people were arguing that jesus will lead prayer from dhuhr because he will be amir ul mumineen. Another said mahdi will continue as amir ul mumineen even after coming of eesa. Mahdi will lead fajr is unanimously accepted by all when Jesus prays first fajr during his second coming. Hence im asking does the hadith prove will jesus be amir ul mumineen?

Our Prophet (saw) often mention prerequisites (signs) before the establishment of last hour in hadiths, what is the book that compiles all those prerequisites from all authentic hadiths and has a good commentary/interpretation?

Imam Mahdi's arrival is one of the Biggest Sign of World Ending,Currently Most of the smallest signs of world ending are Happened(Including People with low Education will get in to the Power(ruling)) .On now days most of the People have a rejection Mentality to everything Because of Terrorist groups like ISIS.In such a situation how the People can understand the arrival of Mahdi Imam.Is there any natural signs provided by Quran or Hadith?