To make your picture black and white go to Image > Mode > Grayscale, if your asked to flatten your image select Flatten.
For the second step go to Image > Mode > Bitmap. You will first get a window asking what method you want to use, select Halftone screen and press ok. You will nog get another window where you can set some options for halftone screen, I used a frequency of 400 and set the shape to Ellipse.
Select the entire image with ctrl + a and copy the selection with ctrl + c. Now undo all actions you have done so that you end up with the original image. Paste the selection with ctrl + v. In the new layer containing the halftone select Soft Light as blending option.