Möbius Transformation from a disk into a specific region

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I am having a problem with a Complex Analysis question. It goes as follows:

Find a general Möbius Transformation $w=Tz$ that maps $\mathbb{A} = \{ z : |z-a|\leq R \}$ into $\mathbb{B} = \{ w : Re(w) \leq -3\}$.

So from my knowledge, I have to set up a generic Möbius Transformation function, say $w=\dfrac{az+b}{cz+d}$ and find the appropriate $a,b,c,d$. And to do that I have to specify three points of $z$.

How would I go about choosing the points and solve the question? Because the question says find general Möbius Transformation, I am having trouble starting the question.. Any hint would be appreciated.