Gyaru style!

from what i understand, theres no definite "gyaru music" genre, some gyarus listen to rap, some to pop, some to rock, some to whatever else, but dance music like eurobeat seems to be popular
so mostly just focus on the fashion aspect, for clothes i would suggest diy-ing or thrifting, since stuff from actual legit gyaru brands can be pretty expensive (but if you do want to spend your money on it thats cool too so do what you think is best, really)
and i dont encourage choosing a particular substyle and only dressing like that, but discovering what you like will help you in terms of finding clothes you like, makeup you like and hairstyles you like
hope this helps <3

hai there! (〃´𓎟`〃) super happy to see another baby gal looking for advice, so heres some i can give you

music - So, from what I've seen I dont think theres a specific type of music that gyarus listen to, as it isn't really a music based genre. So, with that being said don't be afraid to listen to whatever you want as it doesn't make you any less of a gal!! ◝(ᵔᗜᵔ)◜

clothing - For clothing I would recommend you look at second hand shops like depop, thrift stores, Mercari, n even amazon would be a nice place to start! These are the "cheaper" options since actual gyarus brands are a bit pricier but if you're fine with that then some that you check out are Liz Lisa, Emoda, Cecil McBee, & Alba Rose! There are more, but those are just the ones I know from the top of my head..(ᵕ•_•) I hope this helps, good luck on your journey!! ദ്ദി(ᵔᗜᵔ)