I varied the revs, avoided labouring the engine and tried not to rag the tits off it - but don't be scared of using a bit of boost or revving it a bit if needs be.
Because my engine wasn't built in the cleanest of environments I dropped the oil at 100, 250, 500 and 1000 miles. The first two changes it came out like metallic paint and I changed the oil filter at 500 and 1000 miles.
I did drive on the motorway a lot at night (was a student with time on my hands!), as you could do 50-80mph in 4th and 5th to vary the revs a lot. I couldn't go on boost really because it pinked its arse off as PSD had given me an unsuitable chip to run it on.