Healing - Everyone within the area-of-effect circle that surrounds your hero will be slowly healed when you hit the healing spell.
Troop Command - Once you bring your troops into play, they'll march endlessly forward through the level. Every once in a while though you'll be able to hit your character portrait in the top-left hand corner of the screen. This starts everyone marching towards your hero.
Resurrecting Dead Character - When your character is killed you will be given a chance to resurrect them. Doing this will cost you gold coins and more often than not you will be better served by just restarting the level and using the strategic knowledge gained from your failed attempt to make a better new attempt.
Coins - Whenever you clear a stage you will be rewarded with coins, you can also earn coins by gathering them up when an enemy drops them when you defeat them. The more coins you grap the quicker you can upgrade your forces and pick up boosts for your character.