The first thing to keep in mind in RTL design is the way people read or view the page. We scan the page from top right to bottom left, as opposed to LTR languages.
So all elements should behave like we would like the person viewing them to perceive. If you expect the user to first see the main content then see a side block, in LTR you'd put the content left and then the block, in RTL - the opposite. If you have 4 blocks, and expect them to read it in 1,2,3,4 order - in LTR 1 would be leftmost, in RTL 1 would be rightmost.
As for arrows for navigation or other navigation elements, they should behave as in LTR, i.e. if you click a left arrow, an element should move left. However, note that a left arrow in RTL would usually mean Forward, if the content is meant to be linear.
Any other questions, happy to clarify further.
Thanks for considering this.