here are the ranks for the missions on this site. oh yeah if you havent graduated from chunin you are automatically a genin.

-S-Rank
These missions are completed by both of jounin rank and specialized members of ANBU
- A-Rank
These missions are done by Jounin rank ninjas and usually include important tasks including assassinations, escorting important people..etc.
- B-Rank
These are completed by Chuunin rank ninjas.
- C-Rank
These are completed mostly by Chuunins but are sometimes done by Genins.
- D-Rank
This is the lowest class mission that can be completed and are usually done by Genins. These missions are usually small priority.