Below is a chart showing at which points each race can learn their respective abilities and the requirements involved to attain said abilities.
Rank 1: ~
Rank 2:
Shinigami- Learn the name of their Zanpakuto, unlocking Shikai.
Rank 3:
Shinigami- Unlock the first of their Shikai
Abilities.
Word Count- 400
Other races- Unlock fourth ability.
Word Count- 400
Rank 4:
Shinigami- Unlock the second of their Shikai
Abilities.
Word Count- 800
Rank 5:
Shinigami- Unlock the Last of their Shikai
abilities.
Word Count- 1500
Rank 6:
Shinigami-
Unlock the First Bankai.
Word Count- 2000
Vizard becomes available. (See Vizard/Arrancar Rules)
Word Count- 1500
Other races- Unlock their Fifth ability.
Word Count- 2000
Hollow-
Arrancar Becomes Available. (See Vizard/Arrancar Rules)
Rank 7: ~
Rank 8:
Shinigami- Bankai Ability 2.
Wordcount- 2500
Rank 9: ~
Rank 10: ~
Rank 11: ~