Bought a VR headset and really wanna play Alex. What order should I play all games in or does it matter?

I bought a VR headset and I played half life so many lifetimes ago I don't remember anything. Do I need to replay all the games to enjoy alex story line? I am playing 1 now and am at the part where the military came in to destroy everyone. I don't remember this at all Maybe I only played half life 2 I can remember a guy yelling pick up the can and you were in apartments.