Good to hear you got it running

As far as I know there is not preheater as you said? I know there are no glow plugs, its direct ignition. I always pull the choke and it fires up even in very cold weather. I have used Ether if the batteries were low.
Never drive it with low batterys, the generator doesnt do very well charging dead batteries, charge them with a charger first.
Second if the batteries are low and the generator doesnt have enough voltager for excitation they wont charge and you will be driving and all of a sudden it will feel like it came out of gear but it is still in gear. What has happened is the Neutral selenoid (used when the winch is engaged) doesnt have enough power (12v) to pull in and it goes into neutral ive learned that the hard way. Just a tip. Keep the batteries charged!!
Check the oil levels everywhere to be safe especially the hubs. turn the wheel so the plug is about mid way unscrew the plug and see if the oil level is about half full (the correct level ) or if it has oil at all. Sitting for 10 years it may have slowly leaked out, so put some in before you regret it.
Most all the bearings you can get at a standard bearing store.
I have lots of spare parts if you need some. I also get lots off of e-bay in Germany and from Tatra dealers in Chz,
The cv axles are a wear item also so keep them lubed with grease, they are not cheap to replace.
Be sure to keep your air tanks drained of water and your system dry, or it will cause problems
There are 2 levers by your right foot next to the seat, one is for engaging the winch, you also have to hit the neutral switch on the right side of steering colum, its the long I think white switch.
The other level is the high /low for the other 10 gears, they are really low and you would never need them unless towing a tank up a 100% grade.
When I first got mine I thought the engine was underpowered, but now that I have really learned to shift correctly I love it and it has plenty of power, the engine is awsome.
The chamber you put petrol in is for cold weather start, they make a jikov cylinder and you pierce it and it helps start in cold weather, but you would have to be really cold to need that. Just pull the choke and turn it on. I put a manual battery shutoff also because over time they tend to drain the battery otherwise, even with the selenoid disconnect .
pop the covers off in the bed and you will see the electric to pnumatic air selenoids, the two on the crossmember by the winch is for the axle lock and the other is for the inter axle lock, spinning 8 tires on this beast is a blast!!. The selenoid by the transmission is the neutral lock selenoid for when you use the winch, Ive thought about putting a manual bypass valve around it to cure the battery issue if you dont have enough power to pull it in and you are stranded.
Good idea to change the oil cooler lines and the brake hoses, fuel lines also, clean out the fuel strainer bowl and order some new filters. that will be a good start to make sure you have no break downs while driving it. The tow bill is expensive, I had to fix these types of things many times on the side of the road, I should have replaced them at the start.
See if the emergency brake works, most Tatras dont. I had to take mine apart and have a local brake place reline the pads and now it works awsome.
When I get some time I will scan in the page that explains all the switches on the dash and what they do.
Get some english manuals from ATT truck and equipment in alaska, he sell forklifts but also has english tatra manuals and believe me they are worth the money and will answer all the questions you have and more. I also have the workshop manuals on c.d.
Make sure you rubber boots on your air intakes under the engine cowl are not cracked and bypassing air from the air filters.
Make sure the rubber boots on the swing axles are good before you get dirt in them and ruin the bearings. I got a lot of them on ebay, but you have to watch consistantly to find them. Or order them from a dealer over there it will save you lots of headaches!!!
The two red switches on the right of the steering column is for the axle lock and the other for the interaxle lock. So basicly the one engages the front two axles and the other one will lock all the axles.
The two on the left are the dome light and the windshield wipers. The long tall switches (stalk switches) is the blinker turn signals and the other is for the headlights.
Good luck
Dean