The best thing to do is to join a 4x4 club. They usually have organized trailrides and some offer classes for newbies. Here are some I saw that were in NY: (from the UFWDA website)
Long Island Off Road
93 Glen Pasture Ct.
Huntington Station, NY 11746
Doug Abrams 631-385-9679
[email protected]
http://www.ec4wda.org/LIOR/
North Country Off Roaders
172 Blowers Rd.
Gloversville, NY 12078
Bob Gisondi, 518-661-7799
[email protected]
http://atmos.albany.edu/ncor/
Team Mudnuts 4x4 Club, Inc.
Henrietta, NY
Johanna Muench 716-624-4727 x 207
[email protected]
Team Mudnuts 4x4 Club, Inc.
P.O. Box 384
W. Henrietta, NY 14586
http://www.mudnuts.org Scott Kyle, 585-889-0899,
[email protected]
-Mel