Welcome to the board....no disrespect, but you really need to pick up some regulations and take a look at them...they are quite easy to read.
Anywhere around the Tomb, Beckwith, Hope and Christian is a good area for Salmon, Bows and Lakers.
It is possible to catch Salmon in May or June.
I use an 8 foot fluoro leader.
My philosophy for how much line, is the deeper you go the shorter the line....the shallower you are, the longer the line.
Hope this helps.