Also, stress in words. Smaller words. Like что is sometimes said "chtuh". Particularly with потому. How do these work?
What exactly would you like to know? It's all in all too broad a question you are asking.

P.S. Что is never "chtuh" at the very least because the first consonant is a SH, not a CH.

P.P.S. As for the R's just record micro-samples of your soft and hard R's (in words) and we will be able to tell you whether you're doing them right and what you can improve (if any).