I was taught to place my line in between double arrows, no cookie, this was at intro, but I wasn't to do any jumps then anyways.
Later at full cave I was taught to use the cookie on exit side, 1 by each member.
If only 1 arrow, then tie jump right at the arrow
If totally unmarked, then I'm actually not sure what I was taught, I can't remember, but I'm leaning towards placing my own arrow facing the direction of my exit and tie into it. But after acquiring more info later and here, I'm more likely to place a cookie, tie into it and place another on exit side, I will seek further info on this from more experienced divers as well as my former instructors.