This links to the NHS Choices website and gives a really great description of how lupus should be investigated, diagnosed, treated and monitored. You just need to click on the little 'i' to get full information of each step.
I've been quite lucky and my care has been pretty much text book, apart from the usual chasing up appointments and uncertainly over vaccinations.
However from reading these blogs, not everyone gets such good care - so I hope this helps you get what you need.