Well i've never had to "sign in" before so other than be respectful and careful if there are lots of other hunters out there. Don't carry your decoy out and if you have a vest with an orange flag, it might not be a bad idea to have it out as you walk in.

As far as hunting goes however...

When you are walking around keep your eyes wide open for anything like turkey tracks, scat or strut zones. Check trees for any sleeping birds and what not. If you have an owl call and can use it, then use it in the early hours to try to get a gobbler to gobble. As the day goes on try switching to a crow call or a call of the sort. If you do get one to gobble and he's close, set up your decoys and find a nice tree to sit under and throw out a yelp and maybe a cluck or two. If he gobbles back then wait to call about ten minutes then maybe throw out another call. Keep your eyes and ears sharp because he might come out of nowhere. And have your gun up incase he does.