Here’s a bunch of links to segments on Strava that I would consider some of the best/fun/least slop sections of trail on the Hexhamshire Commons, take your pick and just get the OS map out to link them together in whatever way you fancy.
Heading North on west side of Blanchand Moor
Embley Fell towards Whitley Chapel
Technical little section just south of Whitley Chapel
The above three can link together in the order that I’ve written them.
Bolts Law west to east (just south of Blanchland)
Singletrack down to Edmundbyers from Edmundbyers Common
The above two can link together also in the order I’ve written them. Maybe park in Blanchland, take the road up to the west side of Bolt’s Law, then head east across Bolt’s Law followed by the singletrack segment all the way to Edmundbyers and back along the road beside Derwent Water to Blanchland. I’m from just round there and we do an annual Xmas eve ride each year, a few years ago we tried out that Bolt’s Law trail and I think it is my favourite section of trail up on the moors! Haven’t tried the Edmundbyers trail for a loooong time so not sure what that is like. You could always cut it shorter and head down that bit of bridleway marked over Buckshott Fell, although I’ve tried that so I’m not sure what it is like (satellite view seems to look like a shooters double track road).