Welcome to the club. Just keep it simple at first. 9 times out of 10 a good yelp is all you need. I would suggest getting a good calling CD  and get the cadence and sound of the yelp down.

Location is important too.Don't get too close in the mornings. If you know where their roosted, 100 yards is usually close enough. Try to be uphill if possible with no obstacles between (fence,creek,thicket,etc.)

Don't call too much. It's tempting,but if he's coming in hot and heavy, let him come. If you can see him, he can definitely see you if you call.

Just some basic tips. Good luck.