Some answers –
6. Founder Tzaddik/Rebbe of dynasty and approximately which year –
R’ Yakov Kopel Chusid (d. 1787) of Kolomyia, talmid of Baal Shem Tov, is considered the founder of the Vizhnitz (and Kosov) dynasty.
7. Original location – city and country –
Kolomyia or Kolomyya, formerly known as Kolomea, is a city located on the Prut River in Ivano-Frankivsk Oblast, in western Ukraine
9. How is Tefillah conducted (with examples) –
Very strong emphasis on nusach, with their own siddur “Posei’ach She’arim”. Many ‘t’nuos’, such as a special t’nuah before the bracha of Sfiras Ha’omer.
12. Major contribution to Judaism – I would say their warmth to mitzvos, especially Shabbos. The Yerushalmi-based chassidus of Toldos Avrum Yitzchok, with offshoots and adherents globally, is based off the Vizhnitz model.
13. Present Rebbe/Tzaddik and location – city and country –
Many. Two in Bnei Brak (Israel), R’ Yisroel Hager and his brother R’ Mendel; One in Monsey, NY, R’ Yisroel Hager (a first cousin) and his many brothers in Bet Shemesh (Israel), London (UK), Montreal (Canada), Williamsburg (NY), Kiamesha Lake (NY), etc.