Trainer aircraft
There are many model aeroplanes suitable for beginners.  The main criteria are:-

They are easy to fly

They are stable in flight

They are easy to repair

They must weigh less than 7 Kg.

Invariably they will have a single engine

Construction methods have changed over the past 20 years.  However, models based on a traditional balsa frame (like the Ben Buckle Super 60 shown opposite) are still suitable for beginners.  They do take some time and skill to build but the cost can be low, especially if you build from plans.  There are, however, easier ways to get your first plane off the building board.
    
Modern CNC cutting machines mean that parts of many modern kits come pre-cut, all you have to do is glue them together and cover the finished aircraft.  Wings may be made from polystyrene covered in veneer, making a very strong but light wing.  The cost of these models varies but consider £60 to £120 to be about right.  All in all a very much faster method of construction and repairs are usually quiet easy.  This is an important consideration as you will undoubtedly crash whilst you're learning.  Even the very best flyers have been there, done that and got the T-shirt!

Finally there are the Almost Ready to Fly (ARTF) models.  These have become very popular over the past few years because all the major airframe components are already built and covered.  After reasonably simple assembly and installation of the engine and radio equipment you can literally be in the air within hours.  They cost around £70 to £100, look realistic and fly well.  However, you will have missed out on the fun, skill and pride of having totally built it yourself.

At the end of the day you pays your money and you makes your choice but do be guided by those with experience.
Ben Buckle Super 60
Chris Foss Uno-Wot
Irvine Tutor 40