Girilies , I need your knowledge

I never did skincare before and I regret it! Now I want to start my skincare but I don't know where start? There are so many fucking videos with different things, I don't know which one is must or not? What are the things I need know to buy? Is drinking detox water is really changes anything? Do I put my face in a bucket full of ice cubes in the morning ? I don't know anything, there must be a lot right? Can you all the girls pookies help out the newbie? You can also give tips if you have one! I counting on you all!(๑•ㅂ•)و✧