Salam Ayesha,
It has been proven through numerous reports from the Sahaba(ra) to the Tabiyeen(students of Sahaba(ra)) and Taba tabiyeen(students of Tabiyeen) that Prophet Muhammad(saw) comes in dreams and guides people. I know people who converted to Islam and saw him in dreams. There were people who were confused about matters and RasoolAllah(saw) came in their dream and guided them. One of the most famous incidents is that of Uthman(ra) the 3rd Caliph where he saw not only RasoolAllah(saw) but Abu Bakr(ra) and Omar(ra) in his dream before his martyrdom where they informed him that he will be breaking his fast with them.
Ahlus Sunnah Wal Jamah(also called Sunni) the main body of Muslims believes Prophet Muhammad(saw) like other Prophets(as) is alive in his grave. And we know from Sahih Ahadeeth that the bodies of the Prophets(as) are preserved and the earth does not consume them. Numerous Sahaba(ra) bodies have been found to be intact centuries later including Martyrs.
One thing to keep in mind is that Prophet Muhammad(saw) can come in dreams but if this happens and the person talks about matters like the person doesn't have to pray anymore or pay no zakat etc then this dream is from Satan.
Also i would recommend you learn your deen from a qualified teacher and not from a Forum where most people do not know what they are talking about. Taking knowledge from inadequate sources is not what the Quran teaches.
{Then ask the People of Knowledge if you do not know}, [Soorah an-Nahl, Aayah 43 and Soorah al-Anbiyaa., Aayah 7].
If you want i can set you up with a qualified scholar who will be able to help you in learning deen. Where are you from?
Salam
just please need some information who can answer this all question i prepared?
getting an overview of your Q but couldnot understand the core of the Q