I am new to mountain bikes, and have been out of biking in general for many years. I have seen some posts about upgrade pedals and am somewhat confused. When I hear clips mentioned, are these toe clips like on old road bikes, or some kind of clip that fastens to your shoe? Back in the ancient days(early 70's) I rode with toe clips on a road bike. What is the best setup for general gravel road-smooth trail type conditions? Or do I need any clips at all for this type of riding? I have a 2002 Trek 820, all stock.