Upload & Sell: Off
Here's a question I've spent far too much time thinking about! But I think I've finally arrived at a solution that works for me and my casual shooting frequency.
I've got a single catalog and into this catalog I only import shots that I'm going to process. I accomplish this by rather aggressive in-camera deletion (despite the arguments against this) and using Photo Mechanic to select only the images worth processing and dragging those into LR. That way everything in my catalog is edited or going to be edited and it's nice and clean to browse. I've taken to shooting RAW+JPEG as well, so anything very casual, i.e. snapshots that I never intend to process, gets pulled off the card as a JPEG and just dumped into some folders I've got for this purpose.
Because I'm limiting what comes in, I always do 1:1 previews and never discard them, because I have some of my library on an external drive that isn't always attached.
As for Lightroom setup, I disable every module but Library and Develop, turn all palettes to solo mode, and set the left and right panels to be independent of one another. I've also turned off most of the sections in the right-hand Library palette, as I never use Quick Develop.
1) Open card in Photo Mechanic
2) Browse through, mark anything I'd like to edit
3) Drag the marked files into Lightroom
4) They are copied to my RAW folders and sorted using the date structure Lightroom defaults to
5) They are renamed XX_20130101_00001, where XX is my initials, then date, then a sequence number that is running total of all shots I've imported into Lightroom (no use for original filenames)
6) Shots are sorted in to catalogs (I don't shoot enough to fuss with keywords). Catalogs are either shoot specific (if it's a big shoot) or just ongoing, e.g. Landscapes
7) Shots are processed, I'll usually rate them once they are done, that way I know anything with a rating is processed.
8) Shots with a high enough rating are published online wherever
9) I've recently started exporting full res JPEGs into an Exports folder. Although unnecessary, I find it handy to be able to grab these quickly
I've struggled a fair bit with this over the years and have recently come to the conclusion that what works best for me is to only have my finalized, edited shots in Lightroom. Anything else is garbage, or a shoebox keeper. I may eventually get around to using iPhoto for all those miscellaneous family shots, phone shots, etc.