Apparently cant even start psijic til a few quests into summerset main... really killed the get a new build and go killing vibe...
Literally only one quest, the welcome to summerset on that terminates in Artaeum. When you turn it in just off to your left is the questgiver for the start of the Psiijic skill line quests.
Then, when doing the quests, consult Alcast's maps to save time: