15lb is ample as jeremy said there are many ways u can go ,look around and find something your happy with.
just don't go to heavy,mackeral are a lot of fun on light gear even spanish will be stopped quite easy on this gear if your not in a hurry
personally I don't like using braid for macks I prefer the stretch in mono with that initial first hit plus I find braid a bit harsh.
as jeremy said this is only scratching the surface
If your happy with overhead gear I suggest u stick with it.
5 years ago no threadline would be in the boat but times change with plastic fishing and some of the deep jig gear about.
good luc bear