No the trails generally aren't marked. There are a lot of paths along the East side with ad-hoc downhill techie bits - best look at heat maps on Strava TBH. Beware it's very busy with walkers at weekends to the point where I don't bother, particularly on any sunny days, and on the path along the top. Parking on the hills is £5 but if you start at either end lower down there's plenty of free roadsideside parking. I generally start at Hollybush and ride N to Worcester beacon and back, doing a mixture of easy level paths and techie downhills, then use the paths to climb back up.
I'll be riding there Wednesday if you want to tag along.