GetDate() Formatting And Functions Documentation

I'm trying to do something very simple here but I keep getting stuck becuase I can't find much on getDate() in the documenation. Where, in the documenation, does it talk about truncating times, adding to times and all that good stuf.

Below is what I'm trying to do here: I have a while loop that adds to the starting hour of 6am 15 min until it gets to like 7pm. I do realize at this point that just adding 15 is suppsed to add 15 days based on what I have read, but I'm getting an error when I parse this and since I can't seem to find the docs I don't know what to do next?

Msg 102, Level 15, State 1, Procedure PopulateDatabase, Line 32

Incorrect syntax near '@TeeTime'.set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author:Przemek
-- Create date:
-- Description:
-- =============================================

ALTER PROCEDURE [dbo].[PopulateDatabase]
-- Add the parameters for the stored procedure here


AS
declare @CourseID uniqueIdentifier
declare @TeeTimeSlot int
declare @TeeTime dateTime
BEGIN
SET NOCOUNT ON;

--Course 1 *******************************************************************

INSERT INTO
Course (CourseID, Name, Address, PhoneNumber)
VALUES
(NewID(), 'Prospect Lake', '123 Prospect St', 2508129832)

SET @CourseID = (SELECT CourseID FROM Course WHERE Name = 'Prospect Lake')
SET @TeeTimeSlot = 0
SET @TeeTime = '6:00'

WHILE @TeeTimeSlot < 56
BEGIN
INSERT INTO
Schedule (ScheduleID, Course_FK, Date, TeeTime, NumberOfPlayers)
VALUES
(NewID(), @CourseID, getDate(), @TeeTime, Rand(5))
@TeeTime = @TeeTime + 1
END
END