If he expresses an interest in a particular topic, like the stars, or Mexico, we may base our activities around that for awhile. We'll look at the stars and research constellations. We'll check out books on the subject. We'll go to the planetarium. But I personally usually work on the 3 R's on a fairly regular basis, because they are the tools he'll need for a lifetime of learning.
Every state has support groups.
Most major cities or counties have support groups. Any homeschool support group will probably have unschoolers or relaxed homeschoolers in it. You can just search the web for homeschool sites. Many of these will lead to a support group site. In the Memphis area there is MHEA or Memphis Area Home Education Association.