There are plenty of videos on Youtube and plenty of online broadcasters such as Global Tuners and Live ATC.
But, apart from YouTube, the online sources are mainly commercial flights and probably won't help you that much with your PPL.
If you look at that users channel, he has a lot of videos of him flying. I wouldn't copy his flying, he has a death wish, but there is something to be learnt from his RT if you are a new student.
As said, you can always buy a receiver and listen in at your local aerodrome. Or what I use to do was ask the radio operator at our Air-ground if I can sit in the radio room with him and listen in. They've never said no and always spoke to me and gave me RT/flying tips when they weren't talking on the radio. This is probably the best method. If you ring up your local airfield and ask them you might be pleasantly surprised. Might be different with ATC as opposed to Air-ground but no harm in asking.