confused making function.. please help me

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hello
i just tried another day to make function like automation in Airtable. but, it's not easy and i'm about to give up..

for the last time, i would like to ask help.

1.situation
i'm building private car care reminder service.
• Table A : carwiki, each car has its own care interval information.• car_id : 1 / washing interval every 3days / and so on
• Table B : mycar, a user add one's own car to get reminder.• mycar_id 1 : user_id 1 / car_id 1 / recent washed day... 
• Table C : reminder, a user gets reminder generated by one's cars interval days• reminder_id 1 : user_id 1 / car_id 1 / next car washing day... 



2. Problem im facing
i wanna know how to set up function to generate reminder automatically with function. because i have no idea how to fetch each cars interval using relation in function stack maker. 

i tried like this
1. input : myplant info (from frontend.)

     : user_id, car_id, recent washed day...
2. calculation ---- this step, i can't load interval days from car_id table. i have no idea how to to day with data relation in function stack..
3. create record --- still.. cannot do that. it's too hard.

please let me know more details steps... 

once i get what i have to do by steps, i even can make a tutorial videos for people like me who are not really used to backend system.

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