I am completely new. Actually all I have is 3 Jouef coaches

Logically, I will need: controller, power transformer, power connector to track and the track.
Looking at ebay:
controller £17
power transformer £12
power connector £9
so that's £38 to start with the hobby.
A basic starter set @ £50 contains all the above elements with the addition of a locomotive and 2 wagons.
I don't think, I could get a basic locomotive for £12?
Additionally, the starter set has oval track made of 8 curves and 2 straights.
I would then add some 4 meters of flexi track @ £20 and I am a happy train commander

Am I missing something?
Guidance much appreciated!