The first quest players will encounter is their class quest, a festival is happening within the village and the merchants along the roads are seeking assistance, it is broken into three parts.
The first part will have the merchant you had given you the quest ask you to deliver a package to another within the area, crates for the produce vendor from the carpenter, nails for the carpenter from the blacksmith, it would be different depending on which vendor you acquire the quest from.
The second part will have the designated merchant explain the unique factors and mechanics of each race, along with how to arm yourself and equip items.
The final part will have you equip temporary weapons to defeat squirrels in the fields outside the village for the festival, once you've acquired ten nuts you will turn them in to your merchant and you will be able to select your archetype[class].
In conclusion, after you have made your decision- you will have an hour long period to select a different option, but once that timer has been exhausted you will be assigned to your choice permanently.