RTL support for Hebrew based website

Hi,
I’m new to the Customizer theme and certainly not a developer…
I’m building a WP website in Hebrew and currently having these issues:
1. Icons are missing everywhere (having blank rectangles instead).
2. Left/Right sidebars are not working correctly…
3. My Home Page slider isn’t “sliding” although pictures are changing.
I read somewhere I have to make modifications in CSS files and maybe others to fully support RTL flow. Are the above issues solvable? Which files should I edit?

Thanks,
Yuval.