The only way to get more Jutsus is to get Jutsu Cash. Or JS for short.
.:Mission
E-Rank: 5 JS
D-Rank: 7 JS
C-Rank: 12 JS
B-Rank: 18 JS
A-Rank: 24 JS
S-Rank: 30 JS
Each Jutsu has a Rank and an accompanying cost.
.:Jutsu
E-Rank: 5 JS
D-Rank: 10 JS
C-Rank: 15 JS
B-Rank: 20 JS
A-Rank: 30 JS
S-Rank: 40 JS
Each rank gets a certain number of JS to start with. When moving up Ranks you get the JS in the Parenthesis.
.:Rank
E-Rank/Genin: 100
D-Rank/High Genin: 150 (50)
C-Rank/Chuunin: 200 (50)
B-Rank/Special Jounin: 250 (50)
A-Rank/Jounin: 350 (100)
Anbu: (50)
S-Rank/Sannin/Kage: 500 (100)