Drive it until you know more about how it runs, drives, etc. and read through the FAQ section for PM
Spend a few hundred hours reading in the 80 Forum
You can glean some information (ie to get oriented) by watching some You Tube videos for the 80 Series and FZJ80, but be aware,
some of them might not be 100% correct, so don't proceed until you've researched on the forum and asked some questions.
OTRAMM's videos are good.
A few routine items to consider if not done in the last 100,000 miles or so:
Front axle service (wheel bearings, trunnion bearings, CV joint repack, axle seals, ---)
Flush/replace all fluids including brakes, coolant engine, power steering, transmission, gear boxes
Ensure both the front and rear axle breathers work, better to bypass at least the front axle breather and run a hose up to the engine bay. Rear can be extended into the left rear quarter panel cavity.
Replace any old swollen water heater/coolant and radiator hoses and the radiator, Thermostat, and heat control valve if they're the originals.
Plan rust proofing the vehicle (not undercoating). There are many products depending if it's outside or in a body cavity.
For body cavities (inside doors, quarter panels, hatch, lift gate, rocker panels, cross members and anywhere water might get trapped consider 3M Cavity wax.
Order as many OEM Toyota parts (including trim/molding) as you can afford now before they become NLA (discontinued)
There are about 147 other items you'll figure out by reading on the forum