Hey Mombo, you're learning more than you think. The questions you are asking result from you obtaining a base of knowledge, and therefore are asking about the next level. Realizing everything does not appear to be as it seems is a important step, which will save you a lot of heartache and money.

If you go to
http://www.harbourlights.com/default.htm and pick "Collecting" then "Catalog" -
you can find almost every HL produced. Thank you St John (Editorial: 'Good luck in the Sweet 16 !!')

"As far as finding every HL"
You'd be surprised how many you can find and buy if you're Patient, Resourceful,and Persistent Yes, you will need some bucks.
But maybe not as much as you think. Save some money and be on the lookout.

I can't believe how many discoveries I've made. I once had the same opinion as you. This was all changed last month.

As for the other questions you ask, I'll leave them up to the professionals or you can use my above reference and learn yourself.

Good luck, enjoy and do have fun!