Never fished the ross river but i have done a fair bit of freshwater fishing throughout aus. My first bit of advice for a land based fisher would be to download google earth. Look for parks or bridge crossings as your access point to you desired fishing location. The aplins weir gets its fair share of reports in regards to decent barra, which generally is the target species for your area but there are many many more species to be caught if you go down a size bracket. Tarpon, jungle perch, sooty striped and scroham grunter, archer fish, jacks, large gugeons etc. There should be dozens of skinny water locations within an hours drive of you that hold some or all of these species. I would suggest hopping on google earth and identifying a bunch of likely spots and then dedicating your first days fishing to driving around and looking for good looking water holes (by all menas take a rod with you). You can fish small cut baits or worms with reasonable success but if you really want to have some fun get yourself a short graphite spin outfit and a bunch of small hardbodies. Cast at structure or into the base of an inflow etc and work it back and a medium pace and hold on. there is a few guys on this site who are townsville locals who do this thing all the time there. Search back through the freshwater reports and try not to get distracted by all the impoundment barra threads and you'll see some good skinny water threads. When fishing skinny water keep moving, it no good fishing the same strectch for an hour, the fish tend to turn off pretty quickly once you start catching them aim to cover 500m to a kilometer every hour or so depending on what the bank is like. Ok onto crocodiles yes they are up in your part of the world and you need to be mindful of there presence. There are a few things you can do to make things safer. Firstly keep the pet dog away from the water they can draw attention to your presence (they'll also ruin the fishing), secondly if you cant see the bottom either due to depth or water clarity give the bank a buffer and don't wade in. Alot of people say if theres barra then theres crocs is a good rule to keep in mind. Just because there is an obsticle like a weir etc doesn't mean a croc can't make it up there, also just because theres no barra doesn't mean there is no crocs. you'll learn with time what type of water to be wary of, having just come back from darwin where there are more crocks than you can poke a stick at i have a new appreciation of just how smaller body of water can hold them.
Good luck getting into them
Jeremy