The advice on looking through the Scalextric Digital section of Slotforum is good.
The Skyfall set looks like it is Sport track. Sport track is identical to digital track - digital track is simply Sport track with digital features.
Conversion track pieces are available to connect the three different Scalextric track standards together but if you stick to Sport you will be OK.
The Skyfall cars appear to be DPR which means you can easily fit the digital plug to upgrade them to digital - this will take you a minute or two per car.
If you go digital then the Advanced Power Base (APB) will allow you to run cars in analogue (one car per lane if you have twin power supplies) or digital mode (up to 4 cars with a single power supply or up to 6 cars with twin power supplies.)
To convert your Skyfall set to digital you will need to add the APB, a suitable number of chips for your cars, digital hand controllers and some lane changers. That's all. Stick to straight lane changers if you want the analogue running option. Design in one full straight before a lane changer or you may find sliding cars missing the sensors. The same applies to the start/finish line or you risk not registering laps.
The APB counts laps and times them to 1/1000 of a second.
If you buy 3rd party software (SSDC for example) for about $100 you get a cable and software that will allow you to use your PC or laptop to take control of the APB and simulate fuel. Look at the SSDC section on Slotforum to get your mind blown.
Scalextric sell different types of chips which means you can chip pretty much any slot car from any manufacturer providing it has enough space inside the body somewhere to stash the chip.
I think there is a lap counter for analogue sport track but you might consider that to be lost cash if you upgrade to digital soon as the lap counter for analogue will be useless on a digital setup.
Start saving - it's probably even more addictive then when you entered slot rehab!