definitely black hat!
maan, you will have a lot to learn. I normally link newbies with helpful guides, but in this case I wouldn't know where to start because SEO encompasses so many things...
Honestly, spend a day or two in the BH and WH forums and read all of the guides that you can find, and maybe you can complement your knowledge with answers from us or from google, because otherwise we would need to explain everything and it's a LOT
But what I can say is that the main difference between white hat and black hat is that white hat means that you do what google tells you, while black hat means that you do what needs to be done in order to rank in google.
And this difference is important because most of the time what google tells you is complete lies and smoke and mirrors, and if you listen to them you either never rank at all, or only rank for a short while and then you get penalized or outranked by people who do black hat.
So, in the end (after you will have gone through many ups and downs in this industry) you will end up using BH anyway, so I think it's best to start with it from the beginning...
But beware, especially black hat will cost you a ton of money, especially for pirated content as you need to invest your entire fortune into quality backlinks and expired domains and other stuff (automation software, spamming tools and services, etc)