Originally Posted by jon_l
KLX250S, WR250R, DR-Z400, XR650L, DR650SE, whatever. KLR if you are gravel road biased, not so much if dirt means single track.
For a cheap starting point, with your inseam, I'd look for either a KLX or DR650. DR is better on the road, KLX on the trail, both do both.
They're cheap, plentiful, reliable, and no matter what you buy, it will be your first dual-sport but probably not your last.
This is good advice, the red is absolutely true. This is the beginning of your offroad journey. Pick up a well-sorted, cheap Japanese bike. The lighter the better, street legal. Used DR350SE or DRZ400S are good starter bikes. The 650s are fooking heavy.
At your height and weight a 250 is a good idea as well, just make sure it's plated.
Might be worth it to look into a day-long dirt school if you have one locally. You will learn a lot in a day and really shorten the trial by fire.