I think the very best place for you to start is with Earth Joy, a tree climbing school for beginners and advanced tree climbers http://www.climbtreeswithearthjoy.com/default.htm .
They are out of Lexington KY but as you will see on their website, they go to Ohio too. I am a professional arborist. I took my nephew, his wife, and their daughters ages 6 & 8. We had a ball. No equipment needed. Very safe, friendly. You will learn one particular style of climbing to begin with. In the meantime buy the beginner's climbing bible, The Tree Climber's Companion, available from Sherrill and Wesspur. In tree climbing, every decision you make will determine whether you have fun, or die. Spend the money. Be safe.