You need a very large layout to give this justice.
The turntable is designed to operate with the Standard Train Controller. Drive the locomotive onto the turntable, then switch the power from track to turntable via the 'on-on' lever switch R046 (supplied with the set). Your speed controller now controls the rotation of the turntable.
If you are using an HM2000 controller, or non Hornby controller, then the turntable must be powered from the uncontrolled DC output with an R047 Lever Switch, 'on-off', not from the speed controller output.
If you are using a digital controller, you will need a separate analogue controller for the turntable, as there is no facility to digitise this item, except where the digital controller offers an uncontrolled DC accessory output - in which case wire up as the HM2000, although a separate train controller is a better option since it allows the speed to be varied.
The set includes seven access track sections and wiring. You can add and subtract access sections to suit your layout, up to a maximum of fourteen.