Power Pro to Fluorocarbon knot

[Double Hall]

I just rigged a new spinning reel and rod with some Power pro and picked up Fluorocarbon for leader material to try and be a bit more "professional" this season to try and help my odds out. I used Spiderwire in the past, but always tied it directly to a swivel or steel leader.

I primarily use this rod/reel from my boat, and curious as to what knot to use to connect the two lines and how long of a leader I should make. My main concern is having a knot that hangs up in the guides when casting.

Double Uni? Blood?

Thanks