get up early in the morning find a spot to sit down and listen for gobbles?

Yep. Go in EARLY and try to tread as lightly as possible.

Owl hoots and coyote calls, and crow calls may get them going BUT most likely they'll start to gobble on their own time without prompting. I'd get in about 45 minutes before civil twilight and take a nap.

IMO the best bet is to sit and listen, figure out where they roost, then stick around for another hour at least to see if they gobble on the ground. You want to be where they like to fly down, not under their tree.

If you found tracks, they are in the area. Only problem with tracks is you don't know what time of day they're made