I did exactly the same as you 2 years ago - tired of London so moved my stuff (4 van trips) to Poland where we now have a house.
I reckon each van trip cost about £300 in fuel and ferry tickets. Cheaper than a UK removal company and doing it myself meant nothing got lost or broken. I didn't know any Polish people who were able to help but that could be another good option.
I tried to register a right hand drive van in Poland and you can't - it's not allowed because you won't pass the technical inspection. But you can drive your UK car over here if you keep your UK plates. See here: [british-in-poland.blogspot.com/2008/02/english-cars-in-poland.html] - English cars in Poland.
As has already been said, the only way is to convert the vehicle to LHD, but that is so expensive (new dashboard and other parts... not to mention the labour) that it's just not worth it.
Selling your car here will be difficult - again, who wants to buy a car they can't register? Either buy a crap van before you come (which is what I did) and scrap it when you are done with it, or plan to drive back to the UK one last time to sell it.
I have blogged all about this, driving in Poland, importing UK motorbikes, registration etc.. on my blog if you are interested - british-in-poland.blogspot.com.
Sorry I can't comment about getting work here because I haven't tried and don't have any experience of that.
Good luck with everything though!
No, the problem lies in the fact that cars are expensive in Poland. New cars are expensive, so the used are also.
I think another reason used cars are more expensive is simply because of supply and demand - quite simply more people in Poland want to buy old cars and therefore they hold their value better.
As a result of this it becomes profitable to buy used cars from France/Germany/Italy and import them - especially damaged cars which Poles can then repair.
You will see lots of Polish cars towing trailers back from France or Germany with crashed wrecks on the back - anyone been on the E40 motorway lately?
I have a cousin who makes money on the side by buying motorbikes in the UK and cars in Germany, bringing them here to Poland and selling them on.