Sorry I haven't been Posting for a long time, but I had to replace the Keyboard on my Computer....'Cause it broke!!!!
Well, here's how to be a NINJA!
1. Go to the Dojo.
2. Click on the pillow in the corner. (click on the picture to enlarge)

3. The Sensei will pop up.
4. Go to him, and when it says "Would you like to talk to the Sensei?" Click Yes.
5. He will give you the Starter Deck.
6. Fight others, and work your way through the belts. EDIT 2: I'm now Purple Belt.
7. Once you have the Black Belt, fight the Sensei.
8. You should lose atleast 8-10 times.
9. Then, he will be SUPER weak.
10. Beat the Sensei, get the Ninja Mask, go to the Ninja Hideout (located at the Dojo Courtyard) open the Ninja Catalog, buy the Ninja suit, (for members only) and you are now a true NINJA!!!
NOTE:
YOU CANNOT BEAT THE SENSEI WITHOUT A BLACK BELT!!!