RE: trap line
I am mostly into fox and coyote trapping. If you have coyotes where you are going to trapping it is a good idea to double stake all your foot holds with at least 24 inch stakes 3' is better.
Use 2 1/2 to 3 double coil spring trapps.
a smaller trap will get them but they'll pull out unless caught good. Make a dirt hole set and just above the hole about maybe 6" to a foot take a squirle tail and stick it in the ground so it is sticking straight up. It will twich in the wind and they can't resist going over to take a look.
Good Luck