Hi! Glad to hear you're having fun with your vampire detective!
About those oracles: The columns represent the tens, and the lines represent the units. In other words, you roll 1d10 to meet a column and 1d10 to meet a line.
About the blood: You always expend 1 point of blood when you awake each sunset, appear human for a scene, use a supernatural power or heal yourself (edit: after answering this post, I updated the bit about blood and hunger on page 36 to make it clearer). Even if you don't have any Power assets, you'll end up spending blood and needing to feed.
If you have any more questions, don't hesitate to ask them!