Scripting in ArmA is changed somewhat from OFP times.

In OFP we have the SQS scripts which are read line by line, in ArmA now we have the SQF scripts which are read like a code. They are so much more powerful and easier to use once you get the idea, do not be afraid of them even if you've mastered the SQS method before but now the SQF things look strange and scary. Trust me on this, learn it and you'll be amazed how great SQF scripting is.

In a nutshell you never ever should create ArmA SQS content anymore, always create only SQF scripts.

ArmA has “” quotes for STRINGS only and {} curled braces for CODE only. Script commands doesn’t have to be in one line now with the curled braces. Command lines always end with ; instead of a ; *or* carriage return. So you can format code to be more readable

{
    if (condition) then
    {
        DoSomething1;
        DoSomething2;
        DoSomething3;
        DoSomething4;
        DoSomething5;
     };
} foreach array;

Instead of the terrible ofp classic

{if (condition) then {DoSomething1; DoSomething2; DoSomething3; DoSomething4; DoSomething5;};} foreach array;

Comments are no longer the same character as the end of command character.

// my comment
instead of
; my comment

You can use block comments now.

/*
  Comment line 1
  Comment line 2
  Comment line 3
  Comment line 4
  Comment line 5
  Comment line 6
*/

Quotes are no longer a valid substitute for braces.

Some SQF things

_resultArray = [0,""];
_handle = [_resultArray] execVM "resultScript.sqf";
// script runs and changes the _resultArray that is was given
waitUntil {scriptDone _handle};
_resultInt = _resultArray select 0;
_resultString = _resultArray select 1;

Place random vehicles + some units on all found pmc_ gamelogics script, here.