Button Shortcut
Instead of pressing the button on the touch screen to select a unit, just press the R button to cycle through.
Food Fundamentals
A simple civilisation lesson: Move peasants into cells with wheat/grain and order them to build a mill, then surrounding farms. With food established, move onto to other things.
New And Extra Units
Save up your empire points and at the end of the mission do a save and quit. This lets you go to bonus materials on the main menu to buy extra units and maps with your points.