Its tough against twinks in any bracket until you start getting some resilience. Once you get that you'll do alot better.

With Isboxer i dont have any problems switching to a new leader, but if you get 1 toon dead just kill whats on you then either rez or run back and get him. There is no "best way" to do this. Just whatever you prefer. If I'm close to a Graveyard i just release and get full mana/health.