Kiosk to Erables is uphill / upstream on Maple Creek. Also, being your first day you will have more food weight on those portages. I recommend doing this section the other direction at the end of your trip with less food weight.
In early August I was on Whiskyjack with plans to spend the next night on the Nipissing. However, every campsite I passed on the Nipissing was poor to extremely poor. The campsites were so bad that I decided to travel 40+ km back to Brent instead of camping on the river the last night. If you do plan on camping along this section of the Nipissing, the best campsite by far is the one at the end of the 350m portage at Perly Dam Rapids. However, it is literally right on the portage and there are no suitable trees to hang your food easily anywhere in that area.
If you are looking for a longer trip out of Kiosk, I would recommend:
Day 1: Kiosk to Mink
Day 2: Mink to Little Cauchon
Day 3: Little Cauchon to Cedar
Day 4: Cedar to Catfish
Day 5: Catfish to Burntroot, Robinson, or Whiskyjack
Day 6: Burntroot, Robinson, or Whiskyjack to Nadine
Day 7: Nadine to Maple
Day 8: Maple to Kiosk