Go to the spot you plan on hunting and set-up predawn.
Obviously listen for gobbleing. Depending on the size of land you're hunting roost location should remain fairly constant between now and the opener on the 10th. Hopefully they'll gobble for ya' when you go to hunt, and try to set-up as close as possible to them... 100 yards is a good rule of thumb. I've hunted quite a bit first season in Iowa. Be prepared to sweat your but off... or freeze it off. There's quite a bit of GOOD public hunting in Iowa. Where might you be heading to? I'm going second season.