>>365041665
Flat is what people refer to as desktop mode. >>365041495
Maybe when you get the hang of things. I'd still recommend looking at >>365041680
and knowing what you want is the most powerful tool. I tell people that they need to pick one word to represent their basic avatar. Cat, dog, robot, human, lizard, bird, slut, whatever. You can find an avatar that matches your keyword rather easily, no matter what you look up, and customize it from there. You're not expected to stick with the same model forever but having a first model to learn how you do things with, is always good.
Getting people to help you isn't a bad thing. Everyone learns differently, and the first avatar you do is going to be an arduous process if you do it by hand. Expect to only be able to handle learning a little bit at a time.
https://www.youtube.com/watch?v=SRRt2gZOg_Q is what I used when I started
It's outdated, but the only thing you need to know is you should be using Unity 2019.4.31f1 instead of 2017. SDK2 is still viable when you're just starting out, but SDK3 isn't too hard either. There's a lot more you can do with SDK3.