I don't tend to read reference books cover to cover. My plan is to do a slow browse of the MM. I have some broad strokes laid for a campaign and I want to see if the critters I've chosen will fit the level ranges I want them in. I also want to see what other critters jump out at me in an "oh I gotta use that" kind of way.
Then I'll read the character generation and combat chapters in the PHB, plus any others that seem necessary for general play... and then on to the DMG for whatever catches my attention.
Then I'll read the character generation and combat chapters in the PHB, plus any others that seem necessary for general play... and then on to the DMG for whatever catches my attention.