PPC is 'Pay Per Click' and is a form of on online advertsing that often takes place on search engine, and more often than not, Google.
What type of website have you launched? Whether you should use PPC or not depends on your aims and objectives - if your are selling products then it may be beneficial, but if you are offering free content probably not so.
With regards to outsourcing PPC, this can be beneficial but again depends on your budget and strategy. Most PPC programs are fairly simple to use on a basic level, so I would recommend testing what they have to offer with a limited budget, and see how you get on.
Hope this helps, you would like any more advice just ask!