Here you go Stuart - a guy posted this for me about a year ago on RCU when I started thinking about "Soul less" (as we call it :-) ) Electric flight.

What I did, because I'm as lazy as reasonably possible, is simply study the combos on a site such as Tower Hobby, note the recomendations in whatever combo it is - being careful to consider the weight of the airplane in the combo comparitively to the airplane you want to buy, then simply buy the appropriate motor/electronics and battery that matches your airplane. You definitely do not need an exact match.

And by the way, find yourself a guy/instructor/mentor that can be with you on those first flights. Having flown full scale, RC is completely different and quite frankly much more difficult initially.