Heres a nice easy route I have done a few times:
Out of Oldham on Hudderfield Road (A62)
Turn left onto Rippendon Road (A672)
Straight over Rishworth Moor & under the M62 (junction 22) into Yorkshire. Dont worry, its not one way, so if you get worried about being on the wrong side of the Pennines you can always turn round
Keep going - road runs parallel to M62 past Booths Wood Reservoir (on your right), until the road filters onto the A58.
Go through Rishworth, Ripponden, Triange (its a real place name) until you get to Sowerby Bridge.
Into Sowerby Bridge, under the railway bridge & over the canal, onto Wharf Street
Turn left onto Tuel Lane (A6139) signposted for Burnley
At the next T junction (top of the hill), turn left onto Burnley Road (A646)
Through Luddenden Foot (another real place name, honest) until you come to Mytholmroyd
In Mytholmroyd, turn left onto Cragg Road (B6138 ) possibly signposted Rochdale
Up Cragg Road (big uphill) which eventually turns into Blackstone Edge Road when you go over the top of the hill
Keep going, over the moor, up to the T junction & turn right.
Pass the White House Pub on your right & drop down the hill. Just keep going & you will eventually return to civilisation (well Rochdale, but you get what I mean)
If you use Google Maps
http://maps.google.co.uk/ find Hudderfield Road (A62) out of Oldham, you can follow the route very easily.
Hope to possibly see you on the route some time
Alan