You'll very quickly get the hang of this and be playing correctly and with savvy before you know it! While early on, it definitely feels overwhelming (to me too!), this is actually part of the joys of playing Warhmmer. It's not only the journey of learning your army, but the process of learning to "think like a Seraphon General". This is combat style of the Seraphon, to issue commands in the command phase, and cast spells to mitigate the damage that you foresee taking in immediate future. It'll be all the more satisfying down the road and you'll feel more like a wise and ancient Slann for it!