This game is set up into a few parts.
1) management of troop
A) Every unit has so many action points (AP) that they can use during each move.
+It cost 2 AP to place a troop onto the battle field and 1AP to move them once they are placed.
When they have no (or 1) AP point they are useless and must rest.
The rest rate is determined by how many Markets you have.
The more markets you have the faster they recover AP.
Also more markets seem to allow you to rest more units (based on how many markets you have).
B) HP of troops.
+ Every troop has a set HP, and during battle the lose HP when the get hit.
You have to manual click on your troop tab to heal them.
You click the Troop tab of your injuired troop and then hit the (+) next to the HP marker.
Then from there you set how long they heal and how much HP.
Also more hospitals gives your troop more HP each turn when they heal
Also like markets the more hospitals you have will increase how many troops you can heal at once
C) Weapons
You will find a weapon every time you take over a gun shop
Click the troop tab and select the (arrows) to switch weapons
Each weapons will have different ranges and damage levels
Side note (seems the sniper will pierce through the enemy and hit the next one in the same row)
Try having a balance to win the game
D) Leveling up
XP levels you up, which then gives your troops more AP,HP and Damage points
You gain XP when you kill Enemies (this is a slow process) But can be increased by Gadget stores which give you a 5% bounes on XP and Gold
You can train troops by taking over grave yards (more Grave yards more XP gained)
Hit the troop tab and select the (+) next to XP, it works just like the healing your troop but instead of health you gain XP ;)
E) Towers
Give your base more HP points
Part 2
Is a tower defense game. You will lose HP points of troops when they get hit by enemies, and your base will lose HP when the Enemies hit the wall/fence....lose all you HP and game is over.

Maybe more to come if people need help.

Part 3
GOOOOOOOLLLLLLLDDDDD
(Trying to be funny)
Gold allows you to activate your powers. Which can help out in a real pinch. But it is good to hold onto your gold and upgrade in the main Screen. The upgrades here help out every time you play the game. Like it is nice to start out with 3 troops at the beginning of the game or a better weapon to use.