Various questions, need help please.

Hello I'm trying to make an online game (like many people here) but I don't know the way to do it (and if you are going to tell me to go and check other questions from other people or to check tutorials, I just did and it's not helping me).

I also don't know how to make an character maker mode right before someone wants to go online in my game, something like choosing hair styles, eye colour, height, head, etc.

Also, how do I make clothes? I've been looking for tutorials on how to make some but could'nt find any and need to know how to change the character when I want (don't get mad if I'm asking so many questions,

I'm new with Unity and with C# thanks for understanding). I made a CharacterMovement script with the help of some people here but still not working. I wanted it to be something like normal games controll using WASD (not as it is used in unity I hope you know what I mean).

The last thing is how can I make a transition scene? I mean, if I want to make an online game I'll need to create different scenes because if not it'll lag a lot.

I know these are lots of questions, but I'll be so thankful if you answer them, please.
(Maybe I'll ask few more later if I have errors or something)
Thank you very much.