digging

Well, first off I'm going to ask a question that's been bothering me for a very, very long time. I've been digging with my chocobo for a very long time now, and have recently acquired rank 6 digging skill. My problem is this, I've read on several sites that there are titles gained after getting...

Elemental Ore's gonna go up in price. Lv74 Rings gonna go up in price?

http://www.playonline.com/pcd/topics/ff11us/detail/601/detail.html

Hey, I'm new to digging, and did a bit of it today. I have a few questions about it. How do you know when your digging skill raises? Are there areas that are best to dig in if you're just starting? Any information anyone can give me would be most appreciated. Thank you.^^