In all honesty, you're going to get more value for the majority by watching your son play with and enjoy them. Virtually everything is missing at least one accessory, almost everything has wear, and aside from the Jawa and Rebo Band, there isn't anything worth more than about $15 US each. Most would be less than that. It would be hard to find buyers for everything, and unless you get buyers in Australia, shipping will be a deterrent.
The Jawa is the real treasure. Toltoys variant with less obvious spotting than you'd normally find. Missing the gun and slight tears around the arm holes, but this is a very in demand figure, and you'll get quite a bit. The Rebo Band is also pretty good. Perhaps $50 US or so in the condition shown.
Good luck, but stay away from ebay. You'll take a hit as a new seller of SW items, and fees will kill you. That's not even considering the number of scammers out there that will gladly screw you over, and ebay as a company usually sides with buyers in a dispute.
You'll get far more value if you sell on a forum, or even better if you sell on Facebook. Someone else linked to the Toltoys Facebook group. List it there and link back to this thread where you have people confirming it, and you'll almost definitely get top dollar, and likely within hours, if not minutes, of listing.
Ian