How do I even begin to approach spirituality?

I was baptized Episcopalian, raised in a Christian household, and went to Catholic school for much of my upbringing. I left Christianity behind about 10 years ago in favor of athiesm, but recently I've been feeling a call to explore. I've been reading the Kybalion and The Secret History of the World by Mark Booth with an admittedly passing interest, and then I read Rich Roll's Finding Ultra in which he talks about his own spiritual journey throughout his life.

It seems that there is something out there, but once you jump down the rabbit hole and poke your head around, you realize just how purely subjective this shit can get. I miss the church, and I miss believing in a higher power, but I'm certain the Bible is not the one singular truth. I guess what I'm asking is how do I begin my own spiritual journey?