A planet with a 9-year long day would have half of the planet in daylight, and half in night. Depending on the size of the planet, and how close it is to its sun and the amount of power put out by the sun, this would determine how hot midday on the equator gets.
Such a long day on a planet with an atmosphere is likely to result in severe atmospheric storms, with the hot air on the sunny side rising and drawing in colder air from the night side. This air would descend on the night side as catabatic winds, possibly forming rolling cells. The large northern ocean would help distribute the heat from the day side, and might keep the entire northern shore of the continent viable for life, even during the deepest of nights. Hadley cells will result in banding of climatic and atmospheric conditions by latitude.
All of the lifeforms on the planet would have evolved in this system, so would have a variety of mechanisms to deal with the long day and night cycle, from having entire 9-year lifecycles, to surviving the night by laying eggs for the next generation before dying, to cocooning or hibernating, scavenging, or finding friendlier environments underground and living in the sea.
Assuming that the people are in tribal units, those on the northern coast would do pretty well, and might develop something like normal agriculture, along with fishing, growing different crops over the day.
Those further from the coast can stay in one area for a season, before moving on. This would allow them to do agriculture and mining, and they may trade with the coastal peoples. They may even establish cities that are abandoned after the season. If there are several groups following each other, each may stay in the cities for a growing season before moving on.
Those closest to the equator would probably be more nomadic, given the imperative to keep moving, and might raid the agricultural cities further north or south. They might shelter underneath the shadow cast by the ring for shade.
Those south of the equator may develop agriculture in a similar way to their northern brethren, though they would not have a continual stream of coastal communities to trade with.
All of this would depend on the continents that exist on the planet, of course. A standalone continent that doesn't straddle the planet will produce unique lifeforms that can survive both day and night cycles, and peoples who have evolved to live very differently from those on the continent that straddles the planet.