Reading chords online?

So I have been learning guitar for a couple of months mainly off of tabs and youtube tutorials. Recently I've been trying to learn off of these chord sheets like above and they just seem quite different.

Im not sure at all about timing, strumming pattern or when to make chord changes ect and I assume I just need to feel it out, but that gets quite difficult if im listening to songs with a bunch of instruments layered and theres no timing like with tabs (for example with the words and chords I dont know if if thats a rough guide or i need to swap on the syllable). This is also the case with cords lined up together am I just supposed to play them all quickly once?