Races Guide(May be incorrect since i dont remember everything)

As a Human, you start off as level 1, spawned outside in grass field. Sometimes there are dummys to train on in there. Other time s you have to walk to the uraharas to the right of the field then go up the street.
Requirements to attain a race:

Soul:Just get killed to become one
Shinigami:You have to be a soul and Level 150 for student and about 350 for full fledged(NOTE U CAN NOT BECOME A VAI IF U CHOOSE REGULAR SHINIGAMI)
Kidouless Shinigami:At Level 200 talk to urahara as a human.(NOTE YET AGAIN ONLY KIDOULESS SHINIGAMIS CAN BECOEM VAIZ)
Quincy: Level 75-85
Physical Human (Sado): Level 150
Magical Human (Inoue): Level 150
Bounto: Any level you find Rantao
Hollow: Die as a Human by A hollow
Vaizard: Level 1000 is when you can take the inner test
Arrancar: talk to aizen once you get u get adjuchas or vasto

Like mentioned before, you start off as a Level 1, and have to train to get to a certain race. The Requirements to attain a race are listed above. Once you've obtained the race, there are techniques given for chosing that certain race.

Any Race:
Reiatsu Sense
Reiatsu Pressure

Shinigami:
Byakurai
Shakkahou
Soukatsui
Rikujoukourou
Raikouhou
Shunpo
Shikai(Level 402)
Bankai(Level 1100)
Potential to become a Captain or Vice Captain

Hollow:
Cero
Garganta
Strong Hollow
Menos Grande
adjuchas(NEEDS PLAYER KILLS AFTER MENOS NO LONGER LVL REQ)
vastolorde(NEED PLAYER KILLS AFTER ADJUCHAS NO LONGER LVL REQ)
Potential to become an Arrancar(NOTE YOU MUST BECOME ETIER ADJUCHAS OR VASTO LRODE TO BECOME AN ARRANCAR)

Physical Human(Sado):
Form Arm(Evolves into an stronger arm, and even two arms)
Power Blast
El Directo
La Muerte
Sonido

Magical Human(Inoue)
Koten Zanshun
Santen Kesshun
Souten Kisshun
Hirenhyaku

Quincy:
Haizen
Gritz
Volcore
Hirenhyaku
Form Bow
Ransoutengai
Final Form
Web Bow
Seele Schnider

Bounto:(turned off)
Doll
Shunpo
Doll Mastery
Automatic Health Regain

Arrancar:
Gran Rey Cero(Espada Exclusive)
Cero
Garganta
Sonido
Bala
Summon Hollow(Espada Exclusive)
Resurecction is right when u become arrancar

Kidouless Shinigami:
Shikai: Gained when becmoning a kidouless
Bankai: Level 1000
Note: The shikais and bankais boost are half of what a normal shinis shikai and bankai boost would be

Vaizard:
Level 1000 as a kidouless Shinigami and find and talk to shinji for test(plz before u go in to face vai try goin in before u turn on ur boost -.-)
Form Mask
Cero
Bala
Shunpo