Welcome aboard, Scott!
You might enjoy exploring this page:
If you enter the wild card * in the first name field and the surname Duncan, you will get results for anyone with that surname. Then narrow your results by date or location. The search box is at the top of your profile or find it under the Find drop down menu. Give that a try!
You might also want to add Duncan as a tag on your profile. Tags are clickable links to other members interested in the same topics and names as you. They also effect what's included in your Wikitree updates. Click on the word following to add tags.
Come back here to the forum if you have any questions along the way.
Have fun exploring your family history!