However since you have told us that you are a complete “noob with Arduino”; I will recommend that if you really want success with your tank project, that you start small and work through the various lessons (simple projects) that are shown in, The Complete Beginners Guide to the Arduino (there is a lengthy series of posts about the guide at http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1247637768).
Work through the guide over a couple of weeks and you will have gained a good Arduino foundation and be ready to tackle your big opus electronicus (tank project). However even then, you would do well to get it working one function at a time (e.g. get the two drive motors working before you try to integrate the turret, then get the turret working, then the other accessories).
Also with the use of a simple transistor based circuit, you will be able to eliminate a servo to turn the laser pointer on and off)
Start small, see if you can alter the speed of blinking in the blink sketch, then move on to seeing you can turn an LED on with a switch through the arduino, then........