How to implement SQL script in Qlik sense script editor

[sims]

Hey, I am newbie to Qlik sense load script editor. I want a help on how to implement this piece of code in script editor.

How to declare the variables and use them in the select where condition.

thanks in advance.
code:
declare @startDate DATETIMEOFFSET = NULL,

@endDate DATETIMEOFFSET = NULL,

@agentId BIGINT = NULL, 

DECLARE @transactionDateTimeFromLocal DATETIME = CONVERT(DATETIME, SWITCHOFFSET(@startDate, '+00:00')) DECLARE @transactionDateTimeToLocal DATETIME = CONVERT(DATETIME, SWITCHOFFSET(@endDate, '+00:00'))

IF OBJECT_ID('tempdb..#transactionReportDetails') IS NOT NULL

DROP TABLE #transactionReportDetails;

IF OBJECT_ID('tempdb..#transactionReportDetails2') IS NOT NULL

DROP TABLE #transactionReportDetails2;

IF @transactionDateTimeToLocal IS NOT NULL

SELECT @transactionDateTimeToLocal = DATEADD(d, 1, @transactionDateTimeToLocal);

SELECT *
INTO #transactionReportDetails
FROM
(SELECT 

---------------------------------------

WHERE (@transactionDateTimeFromLocal IS NULL OR tt.transferDateTime >= @transactionDateTimeFromLocal) AND (@transactionDateTimeToLocal IS NULL OR tt.transferDateTime <= @transactionDateTimeToLocal) 

AND (aaS.agentId = @agentId OR aD.agentId = @agentId)

AND (@networkOwnerId IS NULL OR td.networkOwnerAgentId = @networkOwnerId) ) AS tmp;