Colour is a key component in websites. In the eighties, Royal Blue was a strong corporate colour but this changed to red in the nineties. Think about how many colours you want in your logo, and what are they? Some companies use 4-5 colours to express themselves - eBay and Google are examples - but normally 1 or 2 colours are best.
With your branding established, you should have a basis for the colour scheme of your entire site. It is vital that you keep different colours to a minimum and make sure you choose complementary colours.
Consistency is everything and when you think about all the items on your website that may need a colour attributed to them, you will see that the devil is in the detail (i.e. logo, buttons, titles, links, background, image borders, back / next, dates…).
If you get the colour scheme right and leave enough of that all important 'white space' you will make an immediate impression on your customers. Good colour schemes show professionalism and care.
There are colour generators that allow you to explore some of the opportunities available. This one even has the choices for contrast available : here
