I want to pronunciate an English well.

[rockjopok]

Hi~ i'm korean, and 22 years old.
um, as you see the title, I want to pronunciate an english well.
My 'r', 'f', 'th' is terrible, specially 'r'..T.T(as well as accent..)
please if you're right, help me(precisely and concretely...)

[Tdol]

Can you try to describe the position of your tongue, lips, etc, when you say these sounds?

[rockjopok]

you mean that 'can I describe that?'
um. I know a little about it, not correctly. But, I don't know how I must pronunciate well, correctly. Please,If you tell me about it, I'll be very appreciate of you.