So looking for your 1st tractor & lots to think about....best advice is don't rush in & buy a tractor, there's plenty around in Aust so take you time to work out your needs (rather than wants) e.g. what's the priorty a FEL, 4WD or a an A/C Cab .CUT or full size ??? ...etc
For $30K you've a limited budget, you'll be looking at used, as a start up allow c.$22K for the tractor & c.$8k from the implements - forget the Chinese Tractors over here, apart from the build quality risk, support is problematic as dealers/brands/distributors change all the time, the biggest concern is resale as they're worth nothing s/h & they won't stand up to much more than light hobby farm work/prone to overheating in our climate..maybe fine for short running a slasher/tiller but cultivating our hard ground tests any tractor.
The Korean Kioti / Daedong's have proven generally to be ok & may offer a viable option in used/low houred.
In used, assuming you wll be cultivating 20 or more acres (of the 100) look around the 70hp+c.85hp range (below 70hp you be limited to a lot smaller gear/working the tractor longer/harder & you'll also be competing for overpriced units with weekend hobby farmer who chase the smaller gear ) fitted with Cat2 3pl,a 540/1000RPM PTO + swinging drawbar.
As to brands JD's & MF, IMO usually bring an unrealistic premium in this HP range, so maybe CASE IH (885's), Landini, Kubota, Deutz, Ford (6610's) - avoid the newer Lamborghini's/Same's & New Hollands in your price range (overly complex & most cost a fortune to repair). In the much older gear (prior mid 80's) if located a good condition Chamberlain 4080, Same (Saturno/Corsaro) or Zetor (7045/8045) may serve you well (though Same/Zetor parts are getting a little scarce). Also consider it's a buyers market in this size gear so negotiate hard, 15-20% off listed price should be easy.
Remember hour meters mean nothing, a strong manintenance record/conditon of the unit is more critical, a well maintained 70hp+ unit should do 8000hrs or more, just be certain to thoroughly test all functions under heavy operating conditions for c.1 hr so full loads/temps are reached.
As for implements, as your in the Denman area there should be quite a few contractors around (haymaking & seeding are expensive equipment & acquired skills) so I'd be outsourcing these tasks & as you're budget's limited you may need to contract more; for example "Ballpark" estimates for used gear:-
Disc's - c.$2.8K+
Chisel Plough- c.$2.7+
Post Hole digger - c.$2K
Spreader/Broadcast seeder - c.$1K
Slasher c.$2.5K+
The other option is buy a cheaper used CUT for fencing/smaller tasks & contract or share crop all the larger operations if your land is viable....