Bars in Unit Description box:
AP (Action Points) - used to perform any movement or action by the selected unit.
HP (Health Points) - lost when the unit is damaged. When this number reaches 0 the unit is destroyed.
AU (Ammo Units) - points needed to fire some kinds of weapons.
EU (Energy Units) - points used to fire some kinds of weapons and for some special abilities.
RU (Resource Units) - points used to produce units and perform research.
EP (Expirience Points) - points gained when the unit attacks an enemy. After filling the whole bar unit gains a level and increases its possibilities.
PP (Progress Points) - Points representing progress on production or research. When the bar is filled the production/research finishes.

Left mouse button: select/deselect unit, press a button.
Right mouse button: deselect unit, turn unit (hold the mouse button).

Moving around:
The game is divided into turns. In each turn players units regain their AP what allows them to make some movement.
To move unit you must select it. You can then see its description appearing on the interface. You can switch through different aspects of the unit using Description Selector.
When you have a unit selected you can see its set of actions (Unit Actions). You can move your mouse cursor over them to see the description.
After clicking some actions (e.g. Move) Vectors will appear in the game field. You must choose one of them as a target of the specific action.
Some Vectors will have direction arrows on them. Usually those arrows show the direction to which the unit will turn to perform the action on the specific target.
Every action made by unit costs AP. After all your units run out of AP and you cant do anything, you must finish your turn. After that another player will make his/her movement.