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There is no exact speed but as every episode premieres, Barry gets faster and faster and eventually can travel through time.

In the episode 'Tricksters' Barry / The Flash is forced to run over 600mph otherwise a bomb attached to his wrist by The Tricksters will explode. Barry removes the bomb via Harrison Wells' request , vibrating through a wall and leaving the bomb on the other side.

In addition, in the episode 'Fast Enough' Barry / The Flash makes the decision to travel back in time by creating a wormhole to the past by running at super speeds. Dr. Martin Stein adds that he will need to be running at Mach 2 to be successful, any slower will result in his death. He then runs this speed and is successful in traveling back in time. Mach 2 is about equal to 680.58 m/s or 1,522.41 mph.

Flash meets Flash of Justice League Movie

For the first crossover you do not. Each episode tells a largely self contained story, with characters from each show simply traveling to the other one's city to fight a villain.

In the season two crossover that begins with the Flash episode "Legends of Today" you probably should watch the Arrow episode "Legends of Yesterday" as the two episodes tell one story. If you don't watch "Legends of Yesterday" then you won't know how the story from "Legends of Today" ends. These two episodes also lead into the spinoff series "Legends of Tomorrow".

Every season, there will be a meta-human villain, but here are the main ones:

Season One: Harrison Wells (Actually Eobard Thawne aka the Reverse Flash)

Season Two: Zoom

Season Three: Alchemy, Grodd, and Savitar

Season Four: The Thinker

Season Five: Cicada and the Reverse Flash

Season Six: Dr. Ramsey Rosso (aka Bloodwork), Joseph Carver, and Eva McCulloch

Season Seven: Eva McCulloch (aka Mirror Master), Nora (aka the Speed Force), and August Heart (aka Godspeed)

Season Eight: Reverse Flash, Despero, Death Storm, and the Avatars of the Negative Force

Season Nine: Red Death, and the Negative Speedforce