The Flash is the first series in the LJA, revolving around Barry Allen and his adventures as The Flash. Episode One will be coming in 2018 and will be followed by Batman Episode One. Nothing after this is confirmed, but the Flash and Batman will probably continue in this order for a few episodes before a new series comes out.
To see all of the characters in The Flash, click [here]
To see the cast of The Flash, click [here]