Id say you would be better off at Lake Illawarra at the Berkely ramp not the Windang ramp. Minnmurra gets busy in summer and the facility's cant handle the increase in punters and Windang is very busy and other than slack tide has a humming current hammering down the channel. The ramp at Berkely is perfect for begginers, protected by a break wall, no current, protected from most winds, two lanes wide ramp, large jetty or beach it on the sand, easy parking and there isn't to many serious boaters there to get upset at the new crowd ( if there are tell em to f off anyway ). In my opinion by far the most user friendly ramp in summer round the Illawarra.
https://www.google.com.au/maps/@-34.4843578,150.855244,400m/data=!3m1!1e3