Ash from SA here, AM for SA. I find my edits take about a fortnight to get through, but I know there was a bit of a speed up recently so this may decrease. Keep in mind, there are delays between roads being driven -> roads appearing in Cartouche and getting edited -> Roads appear in Live Map -> Roads come up on the client (Phones). This whole process can take a month even with speedy editors in well kept areas.
As far as tips, I'd say STAY ENTHUSED! The more you do, the more it seems like this will never end, but every bit you do helps. I love fiddling about, so it's easy for me to do, but remember every bit you add helps. I wrote a bit of a blather under the SA forum post, http://world.waze.com/forum/viewtopic.php?f=56&t=2436&start=20&sid=bf9a672d1bbd1187ea190d226fbb4fa9#p45161
that you might find helpful, and a bit of a guide you can feel free to pass onto any of your minions
This also has a bit of an order of importance, on what can be done to help. More aimed towards newbies, but it might help...
Your role is really to make sure the map stays as tidy as you can, and keep things going. OK road deletions, label roads, so on. Because MOST (not all) people will just drive and not edit nor name their roads you'll likely have to be the one to finish most roads. Get the main ones done, then focus on the side roads, and before you know it your suburbs will take shape!
Good luck, and feel free to PM me with any questions or help you want!!