Its sounds like you have started the right way already mate. Having your uncle around will be a big help.
But use a filter on him and everybody else who offers you advice.
What that means is, filter all advice given, who is it from, how much do you know about them, have they traveled in the desert, jungle or poorer countries in a vehicle before, are they selling you anything etc etc
Over time it will become more obvious what advice from whom seems to suit your travel ideas.
Many people buy a vehicle, give it a big service and drive off. If your on a 3 month 10,000km trip mostly on tarmac then this isn't a bad approach if it is something like a good condition Toyota.
If however you have plans to cross the Sahara, battle your way through the jungles of Central Africa and all of the rest for months on end, then it is well worth investing in the mechanical side of your vehicle.
In a nutshell, (and I hope you are cynically filtering already!!) try to get a grasp on what you want to do and how by reading others websites, then...
1. Buy a Toyota, they are best for non mechanical people (like me!)
2. Buy the Haynes manual of your vehicle and read it until you remember all of the parts and things even if you don't understand them. Try to follow the logic of it through. Fuel goes in here, sits in here, gets sucked along these by that pump, but goes through the filter etc etc
3. Buy Sahara Overland by Chris Scott and read about vehicle preparation (filtering: it's advice just for the Sahara...)
4. Also buy Chris's Desert Driving DVD as it will start to give you an appreciation of other important things you need to know such as driving techniques and what to do when your in the shit ;-)
5. Find a mechanical person who appreciates travel in a vehicle and bounce ideas off them rather than just relying on your uncle (you aren't paying him and he hasn't crossed Africa in a vehicle ;-)
6. Do a mechanical course at your local community college or something
7. Search and post here
8. Watch everything you can on people doing trips.
The Africa Overland Network will provide good motivation and loads of info to filter
9. Do an offroad course and get used to making mistakes where people can help you.
10. Buy this dvd to fill in some of the blanks re Carnets and general travel advice:
http://www.horizonsunlimited.com/sto...wtortw-dvd.php
11, Overhaul your vehicle by thinking from the front tyres in along the axle and back towards fuel tank.
- Research and buy 6 high quality tyres. You need strong sidewalls.
- Tubed or tubeless? You need good quality tubes - michelin or the like.
- Are the rims you have the best ones for the route intended? Strong?
- Then strip down the end of the axles, do the wheel bearings and seals and generally poke around in there and replace things with genuine parts.
- After working along the axle (do the rear obviously) start on the engine.
- Replace the alternator, starter motor, water pump, fuel lift pump etc and take the old ones as spares
- Replace all of the hoses, check old ones, maybe take as spares, else get new ones.
- Radiator? Perfect condition?
- Anything leaking? Fix it!
- Milage of the gearbox?
- When was the timing belt changed? Documented evidence of this?
- The clutch? Have genuine parts been used? etc etc
- Wiring all good?
- Batteries? Best to start with new ones
- Replace bushes? Take spares for sure
- Upgrade the suspension, but lift kits not best way - look into airbags etc etc
and so forth. Then worry about the camping side of things and where you are going to plug your iplonker into ;-)
I hope that helps a little. I started 7 years ago knowing nothing, especially mechanical, and still know nothing, I'm just more experienced at it now.