Several styles out there, 50' is good, I run that amount a swivel & 6' of the same lb sonetimes lighter for the bows. I use 10lb behind my leadcore with lures. Then 8 lb on my steel line with flies. W-Fat
But I'm not very good at fish'in I'm mostly a boater & practice fish'in. B-Man catches more than I do & Mac gets the Big ones.