1. Read the Blademagic Chapter.
You can ask us if there are any parts you don't understand. Mot of it is fairly straight but having a good understanding of how the Maneuver system works will help out immensely.
2a. The jokes about Iron Heart Surge (IHS) were jokes.
Until someone who didn't follow one decided otherwise. IHS really doesn't have the ability to terminate the sun nor can if reverse being killed or paralyzed. The former has no stated duration in the rulebooks and is even presumed infinite like all other timeless entities, real life science isn't a thing in D&D. And the former, no Maneuver can be used if you are unable to move is one of those little semi-hidden clauses for people that read the entries.
2b. White Raven Tactics (WRT) does need a little "You're not your own ally in this case" nerfbat taken to it.
Other than that the Maneuver really isn't borked. Granting the spellcaster an extra turn isn't a big deal since they are probably limited by Spell Slots (or running enough persisted spells no one cares about wrt anyway). It'll actually encourage some cooperation and a little bit of planning too as even the most rudimentary player will want to throw a sales pitch out while begging for an extra turn to shine.
ToB is a great book, you guys will have a blast.