Well I recommend, based on my experience there, that you maybe get some inexpensive platforms or combo spd/platform pedals for when you hit those trails. I had combos on my bike and figured I'd be fine clipped in, but i gave up on that quick. Lots of blind corners and unexpected climbs. Not saying you can't ride cliplesss there (I'm sure i will as i get more familiar with the track), but it'd be nice to give yourself that option for the first couple of times you ride a trail. Don't get me wrong, nothings hardcore. You just may have a low speed tipover or two.

If your not that familiar with the DORBA trails, heres a list and map. It also shows whats open at any given time:

Dallas Off Road Bicycle Association

I dont know whereabouts in DFW you are, but River Legacy in Arlington is a pretty good place to start. I'm in Fort Worth and I hear that locally Gateway is a good easy start, but i understand it still needs some trimming from after the rains. I haven't ridden anything but River Legacy.

The DORBA site has pretty good descriptions of what to expect, and the official DORBA trails are pretty well marked