To be honest, you don't need to buy any book right now. Use google first. Then, if you need book, then buy one. Cheers!
I use internet marketing to advertise my products on Twitter and Facebook. If you know how to select this is a very effective advertising.
social media is the best promotion and marketing right now. because almost everyone in the world uses social media. and you know every news or advertisement is spreading fast in social media. especially when you have a lot of followers or a lot of fans on facebook fanpage. of course it will be easier for you to do marketing. easy, cheap. and a great target, that's the greatness of marketing in social media