Simple way to get two language WP site

Hi everyone.
I am trying to make a site with two languages. I was looking for solution and didn’t found a simple how-to answer. Also, I prefer not to use plugins when it is possible.
*I don’t need translations and I don’t want same content/design.

What I’m trying to do:
1) To have a domain.com/en and domain.com/ru while default redirect is at domain.com/en.
2) One WP engine install, same admin panel with same language – English.
3) Free way of styling things(this include html too, not only css). This is the most problematic part of course.

I can’t figure out how to make this and what are the best practice for this. I know there is a way to call different headers and footers, but I don’t know how to manage this effectively with two languages site.

I am sorry for my not so good English, but I hope you understand me and will help me with this.
*Once again, I am not looking for translation plugins.