My First Campaign

[Loxsis]

I'm starting my first campaign as a DM. I'm opening it with the Chaos Shrine module. My players are Zaran the Genome Thief (player has a little experience in Pathfinder) and Gregor the Hume White Mage (player is a complete first-timer). To supplement the party, I added two NPCs: Nala the Google Black Mage and Loxsis the Burmecian Dragon Child. So far, we just got the quest from the King of Cornelia, got geared up, and killed a pair of wolves.
I plan on two more encounters before we reach the shrine, at which point if we're not 2nd level yet, I'll just bump them up. I also want to start Princess Sarah up as a Bard. When we beat Garland, I'll wait to level them to 3rd until they set up camp outside the shrine, at which point Loxsis disappears (because he molted and ran away in fear) and is replaced with a vieran Beastmaster. Any suggestions?

[Viladin]

If you need extra players, I'm sure there are people on the Discord server that might wanna join.

[Loxsis]

I'm sticking to roommates for now. How would you stat up Princess Sarah if she was a Bard?

Zaran (21) wants to explore the world and record his findings in his journal that he plans to get published; Gregor (40) took up training as a White Mage in a desperate bid to revive his son who recently died; Nala (20) seeks to find the mysterious Hero Shards, magical crystals containing the teachings of great heroes from an era long past; Loxsis (12) left his militia training, fearing that if he doesn't find Sir Regis, a dragoon and champion of Burmecia, soon, Burmecia will suffer greatly.

After escorting Princess Sarah to Castle Cornelia, I plan on having the Vieran Beastmaster lead them to Loxsis' hometown of Tarkio to find its citizens killed by Sir Regis, who was charmed by Esmora the Jagara Illusionist into killing them. Loxsis is also there and rejoins the party, but is now out for Esmora's head (hahahaha, reverse Cat and Mouse Chase!). Any idea which way I should guide the campaign from this point?

[Loxsis]

The main villain in my campaign will be Esmora. Cornelia appears exactly like FF1,  but other than that, the world is is being made by me. Tarkio is a small international trading post of Burmecia, accessable by going across the bridge and about 20 miles East-northeast from there, with the rest of Burmecia in a canyon valley to the north. There is also a large city comprised mostly of artists, aristocrats, and bounty hunters called Lozeau further East from Tarkio.

Should I work on more of the plot, flesh out what I have so far, or complete the world map?