What are the differences between shia islam and sunni islam specially in rites?

the islam from iran is the same shiism that is practice in iraq or lebanon or pakistan? do muslims sunni are the same in egypt and saudi arabia or syria? the druze sect is considered an islamic group? what was the first islam? is the same Quran for shias and sunnies? and hadiths? what are the differences between an ayatollah,sheik,imam? or any islamic leader?