Well, I don't like or use Lightroom so my process wouldn't be much help to you. I will agree with a couple of the up-thread posts that refer to their processes for rating and keeping/deleting images. If you are going to be shooting a lot of images, you need to work up a FAST method to tag and rate them or you will bog down before you ever get to the post-processing step.
I use a viewing/sorting program that has color tagging and use it ruthlessly, as do, I suspect, the folks who do the same in Lightroom. A couple of seconds to look, a color button click and then on to the next. I'll often do a second run through of just the ones I tagged as best, demoting some after a second look.
Spend your time closely examining and then processing your best keepers, not all the also-rans. After the 5* (red-coded for me) images are done you may want to go back and take another, more critical look at the 4's and 3's if you have time.