I only know Krosis' location -what are the locations of the rest? Also, what should I expect when I arrive?
- Hevnoraak - Located in Valthume
- Krosis - Located at the Dragon Lair Shearpoint
- Morokei - Located at Labyrinthian
- Nahkriin - Located at Skuldafn
- Otar - Located northeast of Markarth at Ragnvald
- Rahgot - Located on top of the mountain south east of Riften at Forelhost
- Vokun - Located west of Dawnstar at High Gate Ruins
- Volsung - Located at west of Solitude Volskygge
More detailed information and lore about the priests can be found here: Dragon Priests
And for more information on their masks and related masks look here: Dragon Priest Masks
As for what you should expect, each priest wasn't too difficult for me to defeat but you will find that you have to defeat each one in order to receive the mask. After you get all of the masks and take them to the shrine though, there will not be a priest to face in order to receive the final mask.