I don't advise a flying wing for beginners. While its possible to eventually learn to fly using one, a "conventional" trainer type with an appearance similar toa Cessna 152 will let you learn faster. The only advantage with the EPP flying wing is that you can keep bouncing it off stuff and not break it. (usually...)

The ESC for the R/C car/truck will have a reverse, the ESC for the aircraft will not. Its not a good idea to have the propellor be able to be powered in a reverse direction on the aircraft. Its not a good idea to go without the reverese on the car/truck. You really would want a separate speed control for each purpose.

Depending on the car/truck and the aircraft, they MIGHT use the same battery packs.

You should be able to find a source for R/C stuff that is closer to you than the U.S. A lot of the kits, electronics and so forth are made in either China or Japan, then shipped to the U.S. Also... you need to be certain that the frequencie(s) of your R/C equipment would be legal in your country. US R/C aircraft radios are on 72 mhz frequencies (mostly...) The cars are on ?75? mhz. (I keep forgetting where they are... I just know its different from the aircraft here and illegal to use a car radio for an aircraft, or an aircraft radio for a car.) In England I think they use 35 mhz for the R/C aircraft. Not sure what they use in China or Australia... If you buy it locally, it should be on a legal frequency.

Note that it is impractical to retune a U.S. radio for the frequencies used in England... It may be impractical to retune a radio that's legal in China to make it legal in Austrailia. CHECK before buying the expensive system... maybe you just want a "disposable" Hitech 3-channel set for a short durration stay in China. (servos, batteries and some stuff won't care what frequency RX you plug them into...)

You can get good advice on-line... go ahead and buy from the store that has salesmen that don't have a clue. Discuss the product specs here, and you should do OK.

Make sure you find someone to help you learn to fly... you learn faster and break less stuff.