I'd be assuming that Lando would be more like the Indiana Jones TV show back in the 90's, that focused on young Indy. But in this case, the Lando Post-ROTS thinking of his past escapades; thus leading into Donald Glover taking up most of the show.
As far as Rangers of The NR is concerned; I hope they don't use Leia. If you need her in, use it sparingly and on a small level (if need you can have Carrie's daughter, Billie Lourd, take up for a younger Leia in the similar vein as how Paul Walker's brothers, Cody and Caleb; helped Universal Pictures). Have it focus on New Republic officers investigating and tracking down that of potential Empire strongholds, and explain how New Republic is handling diplomatic and conquestic missions.