I create them every year. I will start them around the beginning of September at corners or natural crossings with a good overhanging branch.
1. Clear the ground with a stick or your rubber boot
2. Freshen the scrape - How? Pee in it. Yes, you read that right. First time I tried it, had 6 bucks hit i the first night. First one within a few hours.

I've also used Bob Kirschner's Silver Top with a lot of success as well.