[Ol Pedro]

I would start with 1/4 spool mono backing since I think your reel holds 270 yds of 40 lb mono. I use a modified Albrite knot for my mono to braid connection.
It should take more than enough braid to fill your needs. I also like to use a topshot for when there's tangles in crowded conditions. Braid to braid tangles are some of the worst. I don't feel that the topshot adversely effects feel.