Pretty much drive it normally, but treat it with a degree of mechanical sympathy during the first 1,000 miles and observe a few sensible precautions;
- avoid excessive engine revs or letting the engine labour in any gear.
- vary the engine speed and change gear regularly so the engine’s not just maintaining a set rpm in any gear for prolonged periods.
- always let the engine oil get up to optimum temperature before driving enthusiastically - not just during the first 1,000 miles, but always.
- bed the brakes in during the first couple of hundred miles and avoid excessively hard braking, unless it’s necessary to do so for emergency or accident avoidance reasons.
- be aware that the tyre treads may still have some mould release agent on them from the tyre manufacturing process so may be slippery - as a result, grip levels may be less than normal until this has been scrubbed off during the first few miles of driving.
- check fluid levels regularly, especially oil, as some new engines can use a little oil during the first few thousand miles. IMO, better to be proactive and carry out manual checks rather than reactive and waiting for the oil warning light to come on.
On the other hand, if it’s a lease car, drive it like you stole it!
