Planning to compile a custom AOSP port/skin, any tips on where to start?

[yan2xme]

Hello, good eve! Meron po bang mga geeky programmers ba dito na may experience at alam po ba na mabigyan ako ng kahit maliit na tips on where to start this coding journey. Napagisipan ko kasing bumuo ng aking AOSP ROM port for my Poco X3 phone na gusto kong i heavy modify at ibahin yung ui for my own liking na plano kong itest pero wala parin akong experience sa UI Coding pero merong maliit sa Illustrator. I would like to experiment and challenge myself... And any kind of help would be really kind and utmostly be appreciated of mine. Thank you