Where can i find....

A list of primary quests for Nightfall........ i did one at Jokanur Diggins i think, at the end i was at Kamadan, but now i don't know what to do next

Arwen

wiki.guildwars.com is your source for all kinds of guru info from quests chains to mission walkthroughs to skill listings ;-)

I actually prefer the wikia for this kind of list. It has nice flowcharts of missions with the primary quests needed to get to them, which is very handy when you're lost in the storyline.

NF mission overview
NF quest list

/wiki in game will bring up the official wiki page. Look for missions section and from there nightfall.

Wiki is your friend.