For people like me who are not used to design a website from scratch, to design a website is a big deal (even if it's just a backend).
To help you out to solve this problem (at least the color scheme one), I found this useful website http://colorschemedesigner.com/ which gives you a color set to use in your website, starting from a single hexadecimal colour. Actually I have redisigned my blog using it!
Just selecting to obtain the scheme:
And then you can see some examples of how a website would look like.