I use songs more than anything to communicate and receive communication from Apollo. When I first started to use this oracle, I would wait until Sunday and offer him a burnt bay leaf, recite one of his ancient hymns, present him with my question or concern, and turn on the radio. The first song I hear, I considered the answer. If the song is almost over, I would count that song and the next one. If you turn it on and there’s a commercial, I would search to the next channel that has a song playing.
This can evolve into asking him things and listening for the first song to come to your mind after you present him with your question or concern, but I recommend starting with the radio method.