I would try this for most of it:
DOWN, down, up, chunk, mute, mute, UP, up down UP, up, down
the first mute is an up stroke, the second mute is a down stroke.
put more emphasis on the "DOWN" and "UP" strokes with all CAPS.
optional: On the last "up down," you should be transitioning to the next chord. For example, strum a 0000 open chord going from G to Em, or barre the 2nd fret from C to D7
DOWN, down, up, chunk, mute, mute, UP, up down UP, 0000, 0000
DOWN, down, up, chunk, mute, mute, UP, up down UP, 2222, 2222
optional: For the D7, barre 2222 and hammer middle finger to the A string 3rd fret (2223) on the first DOWN.
Here's something you can practice:
G
DOWN, down, up, chunk, mute, mute, UP, up down UP, 0000, 0000
Em
DOWN, down, up, chunk, mute, mute, UP, up down UP, 0000, 0000
C
DOWN, down, up, chunk, mute, mute, UP, up down UP, 2222, 2222
D7
DOWN, down, up, chunk, mute, mute, UP, up down UP, 0000, 0000
Your strumming might vary when you start to feel the music, but that's perfectly acceptable. This is just something to get you started and familiarize you with it.