WIPs: an aswang project #1

I am in the midst of a creative thunderstorm. And have been bouncing ideas with my sister, a lover of horror. 
While I prefer the softer reads and happy ever afters of romance, she delights in collecting not just 1 but 2 edition of any and all Stephen King's novels. 
Naturally, when I started on this project, I asked for her input. I'm going to make this my inspiration board of sorts. Bear with me. 

An Aswang project: Book 1

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The aswang project finds Chesa, whose parents died in a fire, uprooted from the Philippines and on her way to live with her aunt's family in Texas. Along her journey, strange coincidences marred with death occur. ​

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.....I haven't figured out what else occurs. I wrote out my entire outline for my second WIP, a romcom called, Love & Lumpia. But horror - this strange genre I've never read or written - has me developing the characters first, getting their arc and redemption, all the while researching folklores and colonialism's effects on Filipino folklore. Speaking of which, one of the characters is Chesa's cousin who happen to be writing an essay on this topic and I've decided I will research this topic ad nauseum and THEN share her essay somewhere in the book! I have no idea where these characters are going to go and who is going to die (its not a spoiler - death is inevitable in ya horror/sci-fi). 

What I DO know:
Chesa - is my main protag. 1st person in this duology. 
Darna, Chesa's cousin - has to survive in the end for her to go back to the Philippines where it all started...whatever "it" is they are trying to find/solve. This is book 2 fermenting. 

What I DON'T know:
Chesa - is she also bad/evil/the bearer of this curse? 
Also, I don't know the middle....but I have a vague idea of how I want the ending to go.