Bought a HJ60 for taking up to Kimberley

Hi all, new to the forum.

I'm in Perth and just bought a HJ60, 01/84 make with original 2H engine. 301,000km, with the gearbox and transfer case reconditioned at 265,000. The motor is good, and to my eye, the mechanicals are generally very good. There are heaps of these for sale in Perth at the moment, the market is very flat - I picked this one up for $5,000. The previous owner was a 55yr old mechanic and had had it for 15 years

Anyway, my point is that this car has some quite serious cosmetic rust. The sills have big holes in them for 3/4 of their length (perhaps where a roofrack once was), and the rear mudguards are bad too. There are holes at the top of the A-pillars which aren't too good. So far, I have cut out and ground back the rust in the sills, the mudguards and the top of the A-pillar. Next I will put in plenty of cold-galv over the bare metal, then mig-weld in new metal where it's possible. After that is bogging, sanding and painting.

But my questions are moreso this. I'm heading up to Derby for work, but would like to use this vehicle to do a little exploring up there. I am a complete novice to 4WDing so would appreciate if anyone could point me to a webpage or something that shows the basic requirements and skills for remote 4WDing in an area like the Kimberley. The car came with twin batteries, though they are getting old, bullbar and spotties. I'm thinking of getting a UHF, Engel, and perhaps some gear to do running repairs, but am not sure exactly what. Also water tanks and fuel tanks, a snatch strap and maybe a jack. What about things like winches, are they more show than go when it comes to a novice like me 4WDing?

Anyhow, any advice appreciated. Cheers