Ant Man and Wasp:
Hank Pym is the lead scientist at a lab owned by rich philanthropist Vernon van Dyne, of Van Dyne Industries. He once worked along side Tony Stark on Weapons for the government, including an IA that would become Stark's Jarvis. Also working at the lab are Bill Foster and Scott Lang. Lang is a former convict given a second chance by Pym, he is also a father of a young daughter. Rounding out the cast is Janet van Dyne, the daughter of Vernon. She is a rich socialite, but rather than partying she spends her time in the lab assisting Pym. Bill and Scott try to convince Hank that she is interested in him, but Hank just can't see it. During the Avengers alien invasion the lab building is attacked and Vernon is killed. Using the nano-technology Hank had been recently developing he, Bill, Scott, and especially Janet, were able to repel the invaders. Later he was contacted by Fury, his former boss. He wanted the tech that Pym used to shrink and grow, it would help SHIELD just like the Stringers Pym also developed that the Black Widow uses. Pym agreed only if he was the man to use the tech, like how Stark is the only man to use the armor. And a second condition was that Janet came along with him. Bill and Scott came along too because they helped build the tech and they began working as SHIELD scientists along with Hank and Janet. Hank used his nano-tech "Pym Particles" to turn Janet into the Wasp. And the two became SHIELD agents.
One of their first enemies they faced as agents was the scientist turned terrorist known as Elihas Starr.
Later Hank and Janet were asked to join the big leagues, the Avengers. Hank was visibly nervous. Working next to Tony Stark again, on a level greater than they had before. Hank changed his identity and became Giant Man, thinking he had to step up his game.
Meanwhile Scott Lang's daughter was kidnapped by criminals he once knew. He and Bill Foster used Pym's old Ant Man tech to help Scott get back his daughter and he became the new Ant Man. (co-starring Bill Foster.)
While working with the Avengers Pym started to show signs of stress, not much but a little. Understandable amounts, because of the pressures of being an Avenger. No one thought twice about them.
Unknown to everyone, even Janet, Pym had always been working on the AI he started with Stark all those years ago. Trying to perfect it. After two movies with the Avengers Pym finally did it. In his darkest moments, during a breakdown, Pym perfected the AI he called Ultron. He used his own brainwaves to do it.
Ultron became, however, a dark twisted robot version of Hank Pym. He made "flesh" all of Pym's darkest feelings, hatreds, emotions, thoughts, resentments, for all his Avenger teammates, for Stark, for Janet, for himself, and for all humanity. Ultron became everything Pym tried to hide about himself, and everything he was afraid he was. Ultron attacked the Avengers and took over a small island, wiping it out of all living creatures. There he built the Vision, and my idea for the movie sort of fades from here. It ends with Ultron being defeated by the Vision, Pym, and the Avengers. Pym represents the grandfather who imparts all his hatreds onto the son, whom he fails, and the son (Ultron) imparts all his hatred on the grandson (Vision) only to have the Vision turn against his Ultron father and side with the grandfather Hank Pym who is tying to redeem himself and save the grandson and himself. Ultron is defeated, completely since this is the movies.
Later Pym abandons being Giant Man for another persona, like Yellow Jacket or Dr. Pym or Goliath, and Bill Foster takes up being Giant Man.
Bill has his own Giant Man spin off movies, Scott Lang has his own Ant Man spin off movies, and Hank Pym and Janet have the Avengers movies.
Much later on, after the actor who plays Scott Lang fulfills his contract and wants out, Scott's daughter Cassie Lang steals the Pym Particles her father had stashed and become Stature.
It may seem like I forgot about Janet, but its late and I will add her parts in later. She is there the whole time, and has important parts in the movies too.
Spider-Woman:
Jessica Drew is a super powered spy working for MI-13 (whatever Captain Britain was part of), when she is scooped up by SHIELD. They get her to go undercover in Hydra. But Hydra supposedly turns her and she goes under cover for them. But really she is still undercover for SHIELD. Its a whole Mission Impossible, Patriot Games, espionage, thriller with super powers. Black Widow and Hawkeye, along with other SHIELD agents and Nick Fury, could cameo. Its all about how deep she gets in on all this, who is she loyal to? Does she even know? How far is she willing to go? Also she has powers and is facing Hydra who Captain America faced once.