There is a comprehensive guide at the Bluescope website at http://www.steel.com.au/products/coated-steel/colorbond-steel/basix-and-bca-classification

Hi there Mary, that's something I hadn't thought of re painting the ridge tiles, I had thought to replace them with the grey, it would depend on the condition of the ridge do they need re setting, this would be a good time to replace rather than fiddle with painting, Woodland Grey is a classic Colour Bond, Gully a bit lighter. Your Roof is a strong red colour, I would get a sample of both grey colours, if you have a spare red tile take it with you to look at samples good luck

So much depends on the style of house , the landscaping , the neighborhood IMO . A colour combo that looks good on a Victorian style house probably won't suit a Spanish style or a Modernist -- even plastered walls look different to weatherboard .

Don't cover the bricks with bagging, if there is no need. Once the brick has been covered there is no turning back. As Kate has suggested, square up the verandah supports, with timber. Then landscape, landscape, and landscape.