I am reading this thread with interest.
My lightroom catalog is also a disaster and since pictures have been moved around on my hard lightroom cannot find them and I think the only way I can fix it it is to start over.
I am a Mom and just take pictures of family functions etc. I have decided that I would like my file setup to be by date, pretty much exactly like nerwin posted above in post #7.... year, month with folders in each month with a specific events. Am I correct in thinking that if I don't remember the date of a specific event I can search my keywords to find something? As an example, I am very active with the Boy Scouts of America and I take many pictures at campouts, etc of the boys in our troop. When one of our scouts reaches the rank of Eagle, many parents do a slide presentation and I am often asked if I have pictures of their son I can send them. If I use my keywords properly and attach the boy's name to a picture I should be able to search that keyword and find all the pictures of that boy I have, correct? Is a keyword different than a tag?
So I guess my question is how do I get all my 22,xxx pictures out of lightroom to start over and how can I develop a good workflow to get my older pictures in one folder at a time so I can keyword/flag/delete as my time permits? I should add that the reason I have that many pictures in lightroom is because my husband imported them all at once with no regard for any file structure.