Check this out: http://geekanddad.wordpress.com/2010/06/22/enemies-and-combat-how-to-make-a-tile-based-game-with-cocos2d-part-3/

It's from version 0/99 something but the core of it is sound.

I have a question regarding the code design of some npc's i am adding to a game i am working on.
The NPC is subclassed from CCNode, and in there i have some variables together with the the move methods:
_body is of class, CCSprite.

-(void) movementLogic:(ccTime) dt
{
    CGPoint moveTo = CGPointMake(CCRANDOM_0_1() * 200 - 100, 0);
    [self logicRun:2.0f position:moveTo];
}
-(void) logicRun:(float) duration position:(CGPoint) moveTo
{
    CCMoveBy *move = [CCMoveBy actionWithDuration:duration position:moveTo];
    [_body runAction:move];
}

In a scene i am testing it on i add a few based on spawn locations from Tiled:

- (void) addNPCAtX:(int)x Y:(int) y Type:(int)type
{
    NPC *npcClass = [NPC npcWithParentNode:self];
    npcClass.position = ccp(x,y);
}

They do appear, but they don't move. I also have a feeling that i am not in control of them, in case of later use where i need to do some collision detection.
Could someone point out, what I might be doing wrong? Thanks for the time guys.