I wish you'd be in MD - I could recommend some very good places to start. :)
Anyway... Look for lessons barns in your area, take your wife in couple places you like and watch the (beginner) lesson or 2 (how people ride, how instructor teaches, etc.), if the horses are well-cared, etc. The fear sometime is hard to overcome, but on confident horse and with the good instructor it's possible (and sometime take no time to get over it). Good luck!
"Life isn't about waiting for the storm to pass: it's about learning to dance in the rain..."
"When we are no longer able to change a situation - we are challenged to change ourselves."
"How people treat you is their karma; how you react is yours."