I don't know that I'd bother with a leveling guide beyond something extremely general, as for the moment that's all the system requires, and the basic pattern is quite... well basic: Grade 1: grind to level 5, Grade 2: leves until 10, grind to 15, Grade 3: leves to 20, grind to 25, Grade 4: leves till 30, leves and grinding until 35, Grade 5: leves and grinding until 50
Important to note that in La Noscea and Thanlan, there is at least one grade 4 node in each that is either camped by aggressive mobs or close enough to a pack to make aggro possible, so if you are targeting a specific ore you'll need 38 and stealth IV in order to mine every single possible node.

Also for your own personal use, www.disciplesoftheland.com has an enormous amount of resources available for every DoL, as well as forums for each which I'm sure already have most of the information you are looking for.