Hello!

I am currently creating a playable race mod that also comes with a quest-line. I want to make the quest only start if the player is my new race. How would I go about doing this?

When do you want the quest to start?

You could use Story Manager and for example create a new node that will start your specific quest, all you would need to do is place a condition on the node using the function GetIsRace with your custom race selected = 1 and run it on the Player.

It's kind of up to you what type of event you would want.

You could also just start it with a script on a trigger box or an activator and have properties filled with your quest and your race, basically just doing the same as above but with Papyrus.