Moving from MC coding to frame code setup

[Darkblade]

As I have started development into a new game, and am starting to notice some fundamental benefits of AS3, I would like to invest time to learn how coding works under the setup of the actionscript on the frame rather than inside the movieclip in AS2. I would really appreciate if someone could point out what I am doing wrong! I have tried to port over this code:

onClipEvent (load) {
    //variables
    var stepnum:Number = 10;
    var attack:Boolean = false;
    var stance:Number = 1;
    var crouch:Boolean = false;
    var moving:Boolean = false;

    //aiming variables
    var aimUp_lower:Number = 10;
    var aimDown_neutral:Number = 15;
    var aimUp_neutral:Number = 20;
    var aimDown_upper:Number = 25;
    var aimNeutral:Number = 30;

    var aimlevel01:Boolean = false;
    var aimlevel0:Boolean = true;
    var aimlevel1:Boolean = false;

    //Keyboard controls
    var DOWN:Number = 40;
    var UP:Number = 38;
    var LEFT:Number = 37;
    var RIGHT:Number = 39;
    var SPACE:Number = 32;
}

onClipEvent (enterFrame) {
    //movement
    if (Key.isDown(RIGHT)) {
        this._xscale = 100;
        moving = true;
        stance = 1;
        this._x += stepnum;
        this.walkcycle.play();
    } else if (Key.isDown(LEFT)) {
        this._xscale = -100;
        moving = true;
        stance = 0;
        this._x -= stepnum;
        this.walkcycle.play();
    } else {
        this.walkcycle.gotoAndStop('idle');
    }
    if (Key.isDown(DOWN)) {
        this.aiming.gotoAndStop('aim_down01');
        aimlevel1 = false;
        aimlevel0 = false;
        aimlevel01 = true;
    } else if (aimlevel01 && !Key.isDown(DOWN)) {
        this.aiming.gotoAndStop('aim_up00');
        aimlevel1 = false;
        aimlevel0 = true;
        aimlevel01 = false;
    }
    if (Key.isDown(UP)) {
        this.aiming.gotoAndStop('aim_up01');
        aimlevel1 = true;
        aimlevel0 = false;
        aimlevel01 = false;
    } else if (aimlevel1 && !Key.isDown(UP)) {
        this.aiming.gotoAndStop('aim_down00');
        aimlevel1 = false;
        aimlevel0 = true;
        aimlevel01 = false;
    }
}

Like this, but the code doesn’t work… I need some help

stop();

function VariableSetup() {
    //variables
    var stepnum:Number = 10;
    var attack:Boolean = false;
    var stance:Number = 1;
    var crouch:Boolean = false;
    var moving:Boolean = false;

    //aiming variables
    var aimUp_lower:Number = 10;
    var aimDown_neutral:Number = 15;
    var aimUp_neutral:Number = 20;
    var aimDown_upper:Number = 25;
    var aimNeutral:Number = 30;

    var aimlevel01:Boolean = false;
    var aimlevel0:Boolean = true;
    var aimlevel1:Boolean = false;

    //Keyboard controls
    var DOWN:Number = 40;
    var UP:Number = 38;
    var LEFT:Number = 37;
    var RIGHT:Number = 39;
    var SPACE:Number = 32;
}



function movement() {
    //movement
    if (Key.isDown(RIGHT)) {
        _root.MasterChief_mc._xscale = 100;
        moving = true;
        stance = 1;
        _root.MasterChief_mc._x += stepnum;
        _root.MasterChief_mc.walkcycle.play();
    } else if (Key.isDown(LEFT)) {
        _root.MasterChief_mc._xscale = -100;
        moving = true;
        stance = 0;
        _root.MasterChief_mc._x -= stepnum;
        _root.MasterChief_mc.walkcycle.play();
    } else {
        _root.MasterChief_mc.walkcycle.gotoAndStop('idle');
    }
}


function aiming() {
    if (Key.isDown(DOWN)) {
        _root.MasterChief_mc.aiming.gotoAndStop('aim_down01');
        aimlevel1 = false;
        aimlevel0 = false;
        aimlevel01 = true;
    } else if (aimlevel01 && !Key.isDown(DOWN)) {
        _root.MasterChief_mc.aiming.gotoAndStop('aim_up00');
        aimlevel1 = false;
        aimlevel0 = true;
        aimlevel01 = false;
    }
    if (Key.isDown(UP)) {
        _root.MasterChief_mc.aiming.gotoAndStop('aim_up01');
        aimlevel1 = true;
        aimlevel0 = false;
        aimlevel01 = false;
    } else if (aimlevel1 && !Key.isDown(UP)) {
        _root.MasterChief_mc.aiming.gotoAndStop('aim_down00');
        aimlevel1 = false;
        aimlevel0 = true;
        aimlevel01 = false;
    }
}


//Function calls
VariableSetup();

onEnterFrame = function () {
    movement();
    aiming();
};