Windon isnt necessary,but helpfull.weve boated alot of 100 to150# tuna without. As for knots id say a bimini twist or spider hitch.Probly alot of other opinions but it works for us.Good luck and tight lines
Wind ons aren't necessary, but if you have an inexperienced crew it does get rid of the leadering step. For meat fishing I attach a 130 lb Spro Power Swivel to my mainline with a 7 turn Uniknot. I crimp the leader on.