The easier way to achieve this is by gain a "specialization" from the food source you settle next to first. I mean:
1- In the first Era (pre-Ancient) you explore as a Nomad to find the best point while also hunt-gather food resources.
2- You need to find a good spot that have some kind of food source (also considering your civ bias) and found next to it your first Settlement, so when it grow enough it turn in your first city at the same time you advance to the Ancient Era, also you got your "specialization*":
A- AGRARIAN, from resources like wheat, rice, corn, potato, etc. Eureka for Writing and Calendar.
B- PASTORIAL, from resources like horses, camels, reindeer, etc. Eureka for Wheel and allows built Pastorial Camp that exploit resources, provide population and train units like Horse Archers and Camels riders. The objetive of this is to expand in steppe and desert without by a MUST to build more cities in early eras.
C- MARITIME, from resources like oysters, crabs, seals, etc. Eureka for Sailing and allow to build early boats.
Just a point, but Calendar was also required for hunters, to be able to predict seasonal migrations and intercept them for optimal hunting. There are wood and stone 'calendar circles' archeological sites in Central Asia and eastern Europe where there are no indications of agriculture. I suggest that Calendar could still be kept for Agrarian for Game Purposes, but Archery could be added for Pastorial, since the horn, bone and sinew from animals are all prime raw materials for bowstrings, arrow points and bows.
Likewise, the earliest indication of woven fibers (pre-agricultural gathered flax) was to make fishing nets, so Maritime could also get a Bonus for Weaving/Sailing. And a 'maritime' location could be a marshy river as well as a coast, since marshlands were prime grounds for fish and waterfowl that could be hunted or trapped with woven nets.
I would, therefore, modify your Initial Choices as follows:
AGRARIAN - requires access to Grain, Maize, Rice, or Potato, starts with Agriculture, provides Bonus for Writing and Calendar
PASTORAL - requires access to Cattle, Sheep, Horses, Camels, or Reindeer, starts with Animal Domestication, provides Bonus for Wheel and Archery
MARITIME - requires access to Fish, Shellfish, or Seals, starts with Boating, provides Bonus for Sailing and Weaving.
Note that the 'starting' Tech in each case would 'lead' the Civ into a specific Food resource area from the first City/Settlement/Mobile Camp founded. That would make the initial Choice have both immediate and long-range Importance to the Civ and how it develops - and how you have to play them.
Just need to point than central NA natives "skipped" the process and conditions for the domestication of horses, Eurasia used to have also great hers of Bisons and Aurochs, even wild Horses used to be the main food source in both sides.
The European and Steppe Bison were never as dominant a food and resource animal in Eurasia as the Bison was in North America. I suspect because in Eurasia they competed for grazing with aurochs, cattle, sheep, goats, and horses. Counts of bones from food middens in archeological sites, at least, don't show a lot of bison bones, while, based on their location, they show quantities of deer, sheep, goats, cattle and/or horses.
Once they got access to horses, the NA natives jumped to domestication of the horse very quickly (in many places, less than a century), and groups like the Nez Perce and Comanches also developed selective breeding for traits they desired in the horses. The speed with which they started exploiting horses, in fact, may speak to how fast the horse was originally domesticated, although the whole question of first domestication and types of exploitation of the horse (as draft animal, food animal, or mount) is still one of the most debated topics in Old World archeology.