Starting trees from seed requires knowing the germination requirements for the species you wish to grow. Most native tree seeds require treatments to break seed dormancy before the seed will germinate. These are done naturally by weather cycles, moisture, sunlight and wildlife in the forest environment. When we collect seeds, we will have to simulate these natural events to germinate the seeds successfully. The Woody Plant Seed Manual, a U.S. Forest Service publication, gives detailed germination and nursery culture instructions by genus and species of trees.
Check out this general germination guide for some common tree species.