+1 for not caring about data unless it's for specific portions of a ride.
I believe you follow me on Strava, so you can analyze every aspect of my rides if you like. You'll notice that they are fairly polarized...that is to say I'm either "on it" or I'm not. If I want to see specific portions of my data, TrainingPeaks is what I use.
As far a cadence is concerned, that'll be something that develops as you get more miles in your legs. Cadence also changes based on terrain and fatigue, so don't feel the need to hold a steady cadence throughout the entire ride. Just do what feels efficient.