1 Avoid entry level train set manufacturer labelled systems like Bachmnas and Hornby - you will outgrow their lack of functionality very quickly.
2 Never mix DC and DCC, especially with clever changeover switches. It will inevitably end in tears.
3 Buy well and buy once.
4 I have used Lenz for 18 years but I suggest you look at NCE, Gaugemaster, Lenz and Digitrax. The current UK best seller is NCE Power Cab
John K
edited for typos