Short answers, pulled from the story.
The word vampire first appeared in English news reports during the year 1732. This specific date marks a turning point when officials in Austria gained control of northern Serbia and Oltenia following the Treaty of Passarowitz signed in 1718.
Vampires were usually reported as bloated in appearance with ruddy, purplish, or dark coloring resulting from recent blood drinking seen seeping from the mouth and nose. Their left eye remained open while they wore the linen shroud used for burial and their teeth hair and nails appeared to grow though fangs were not a standard feature in early folklore.
Petar Blagojević from Serbia died at age 62 but allegedly returned asking his son for food before being found dead the next day after attacking neighbors who lost blood. Government officials examined bodies and wrote detailed case reports published throughout Europe regarding this incident which occurred between 1725 and 1734.
The charismatic vampire emerged in 1819 with John Polidori's The Vampyre featuring Lord Ruthven which was highly successful and arguably the most influential work of the early nineteenth century. Byron dominated personality mediated by Lady Caroline Lamb influenced Polidori's undead protagonist.
The first film portrayal of Dracula appeared in F.W. Murnau's silent German Expressionist horror film Nosferatu released in 1922. Universal's Dracula starring Béla Lugosi arrived in 1931 as the first talking film to portray the Count.
The word vampire traces back to Old Slavic languages with forms like onpyr or upir and parallels exist in Bulgarian Macedonian Turkish Tatar Chuvash Bosnian Croatian Czech Slovak Polish Ukrainian Russian Belarusian and Albanian dialects. Some scholars suggest a Turkish root from uber meaning witch that passed through Hungarian and French before reaching English while others argue for an Old Slavic derivation involving a nasal vowel characteristic of Old Bulgarian.