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here is the ninja culture from the website Wikipedia

A ninja organization would be headed by a jōnin (上忍), literally "high ninja". Under jōnin would be several chūnin (中忍, "middle ninja" wink . Under chūnin would be several genin (下忍, "low ninja" wink . Upon receiving a mission from daimyō, the jōnin would use the chūnin to select necessary personnel from among the genin. Some ninja groups would be smaller and may have been less structured. Other groups may have been structured more like an army and the leader may instead have been called shō or "general".

While ninja are often depicted as male, females were sometimes, but rarely, ninja as well. A female ninja may be called kunoichi (くノ一); the characters are supposedly derived from the strokes that make up the kanji for woman (女). Though sometimes depicted as experienced prostitutes who learned the secrets of an enemy by seduction, they rarely used that method. Most prostitutes in medieval Japan were in brothels and few would take their chance with a freelance prostitute; in many places, it was illegal to do so.

The nindō (忍法), literally "methods of ninja", refers to various skills used by ninja, but mostly supernatural and fictional.

Ninja had many rules and the most important rule is of keeping the secret of ninja themselves and of the daimyo who gave them the order. The most severe crime is leaving a ninja family without authorization, and with no intention of coming back. He or she would be called nukenin (抜け忍) and his or her family members would be tasked to bring him back, dead or alive.

OK, now for the weapons and accesories from the website Wikipedia

Most of the time, a ninja did not, for obvious reasons, dress in an all black suit (shinobishōzoku (忍び装束)). Ninja rarely dressed as such, since an important aspect of their work was in espionage. Some parallel to this over-dramatization can be drawn by comparing movie series of James Bond and actual works of a spy. In actual practice, ninja did not wear the commonly depicted all black suit. It was actually a shade of dark red, dark green, dark blue, or dark brown as it offered a better camouflage. The idea of the all black suit may come from the clothes stage hands wore at the shadow theatre.