To give you an idea, I bought a 2004 Corolla (200 000kms) for $4000 with a slipping clutch one year ago, and at the time all the other Corollas of the same age were around $6000 to $7000. I'd say you could get close to $4000 for your car if you fixed all the problems. But you almost always lose money fixing stuff just to sell it, I find it's better to just sell stuff as is than it is to sink money into it and try and sell it.
But if I were you and I were planning on keeping the car, I'd fix what I could myself then pay the mechanic to do the rest. Like what Parrot said, the dampers are not hard to change with a decent tool kit and some spare time, and they are pretty cheap from Repco/Autobahn/Supercheap Auto.
I just looked it up and a pair of aftermarket KYB dampers will cost you $380 for the fronts and $250 for the rears from Supercheap Auto.
Wipers are like $15.
Coolant flush is super easy - just remember to bleed the system afterwards.
Then pay the mechanic to change the serpentine belt and the inner CV boot and be glad you don't own a Volkswagon.
Or if you're not planning on keeping the car, just sell it as is.