hi
Suggest you have a look at the website of the Ronde Museum in Oudenaarde:
http://www.rvv.be/en/tourism/routes
and there are three loops which, collectively, do the whole of the lumpy bits of the Ronde. You can get route brochures from the musuem, or just follow the signposts. There is also a hard-to-find map (in Flemish) that covers all the climbs, I found a copy in a bike shop there, cost 5 Euros. All the famous climbs except Kapelmuur are fairly near Oudenaarde.
I found the downhill cobbles to be quite tricky, the bike was drifting a bit with increasing speed. For some reason the pave is popular with motorcyclists and the Koppenberg and Paterberg are very narrow. Have fun - it is quite an experience!