There is a slight delay from the time the stream is started, once the timer has counted down it should be no more than 30-40 secs and the stream should automatically start. If for some reason doesn't start and continues to display the message 'This event has not started yet' try the following;
If the picture quality is poor, check the resolutions setting (gear icon) its best kept on auto as it will provide the best quality based on your internet speeds.
To help ensure you get the best quality picture possible it is recommend that the only device connected to your WiFi/internet is the one you intend on using to stream.
In most cases there should be no issues with the sound, if you cannot hear anything please check your volume setting and make sure you haven't muted by mistake, if its not working on our end we should know straight away and will having it working as quickly as possible.