I'm learning Russian, but I want to know more casual ways to speak with someone.

When you learn a knew language you tend to learn a very formal/platitude way of speaking. If I just wanted to hit up a friend and say things like
Whats up?
What are you doing?
Want to hang out?
And also how to respond to such questions would be appreciated!
I know how to say Kak Dela and Harasho but is that how you would talk between friends?
And also I cant read Russian, so spelling your answers phonetically would be helpful ^_ Spasibo
Any casual phrases like
Yea me too
Want to get dinner
Or like if someone asks how you’re doing and you’re feeling like “not so good” or “Eh, I’m okay” obviously not direct translation is needed.. just something to that affect!