new to braided line please help

[007 striper sniper]

hello all

I have always been a mono guy, but I recived some power pro 20# as a gift and I fiqured I would give it a try. I will mostly be using it to chunk herring or live line some mackeral. puting it on a baitrunner 35 or 4500 and fishing from a boat. So my questions are backing, how much and what# how do i tie it to the braid, btw I have 150 yds of braid, and I am assuming I need a floro or mono leader, how long and what # for that? And do I tie that on the same way? I think I dug out all my gear a little to early again this year it only makes the waiting worse!!! Any help would be great.