Some Ninja stuff.

Average Chakra levels-

Genin- X units

Chunin- 10 X units

Jounin- 100X units

Elite Jounin- ??

Kage- ??

Nin arts proficiency level-

Level 1- Novice(Beginner)

Level 2- Intermediate(Can use that skill to such level that the application of the skill is useful in Genin level battles.)

Level 3- Advanced(Same as above but for Chunin level battles)

Level 4- Expert (Same as above but for Jounin level battles)

Level 5- Master ( Same as above but for Elite Jounin level Battles

Level 6- Grandmaster (Same as above but for Kage(or S rank) level battles

Analogous example for above using Chakra Control as an example:

Level 1- learning Leaf sticking with different amounts of mass of an object, multitasking at different chakra points, having basic understanding of internal chakra Control

Level 2- Water Walking(External Chakra Control) OR degree of Chakra Enhancement dangerous for Genins

Level 3- degree of Chakra Enhancement dangerous for Chunins OR Messing up other individuals' internal organs by sending your chakra to the opponent

Level 4- degree of .... for Jounins OR Shape Manipulation(Rasengan)(External Chakra Control)

Level 5- degree of ... Elite Jounin OR Mitotic Regeneration