So a while back I sent you all a Noteboard called 'RPG Game Powers' which had all your characters Powers at the current level. (I accidentally sent two to you - ignore the one dealing with poisons.)

First thing about combat is that turns are determined by initiative order. In this case, that's Guard 1 (already played), Maravin, Guard 2 and Guard 3.

On your initiative turn you can use up to three actions:

A Standard action
A Move action
A Minor action

You can always convert one of your higher actions to a lower action, so that you would have two Move action by sacrificing a Standard action. Move actions are pretty self-explanatory, Standard actions are most attacks, minor actions are less dramatic stuff like opening a door or picking something up.

You don't have to use all your actions, but if you don't use them, they are lost.

You can use Action Points to gain a bonus action of your choice in a round.

At will Powers can be used as long as you have enough actions to perform them. Encounter Powers can only be used once in any given scene or combat, while Daily Powers can only be used once until you have had time to rest.

There could be variations, but I think I've written most Powers in this format, which is the one used in the PHB:

Type of action (Standard, move, minor) - Range
Requirements (if any)
Target of the action
Attack: Ability vs. Defense
Hit: Damage and effects
Miss: Damage and effects

Range comes in either melee or ranged, which are determined by the weapon you are using or a flat number included in the description, Close burst, which affects all hexes a adjacent to you for a range included in the description, Close blast, which takes the shape of a cone with you at its point, its width and length included in the description, Area burst affects a target hex and a number of hexes adjacent to it included in the range description The second number is the distance withing which you can target hexes..

Attacks are calculated by rolling a 20-sided die and adding a number of modifiers, usually including a primary ability (Strength, Constitution, Dexterity, Intelligence, Wisdom or Charisma). The ability used for a specific Power is included in the attack description, and you are usually better using an ability that plays to your character's strengths. The defense is either Armour Class, Fortitude, reflex or Will, which have different values depending on the enemy.

I think that's a good basis, if you need further help, be sure to ask.