Does it cost anything to get started? Not a penny. Afterall, you're looking to "make" money, "not" spend money. PTC's pay people to simply view ads, 10 second to 1 minute ads. They don't pay a lot in the beginning but your earnings grow the longer you stick to it and eventually learn the little, " tricks of the trade". There are "upgrades" in membership levels that can be purchased eventually if you like to increase your earnings but they are by no means required.
A little tip regarding purchasing upgrades if you are inclined, I simply waited until I had made enough money on each individual site to pay for the upgrade so in fact, not a cent came out of my pocket. It's an option but again, upgrades are not necessary to make money they just make it faster.
The banner below will take you to the best paying and most reputable PTC site around, ClixSense. I personally use it daily and have been paid multiple times via PayPal. Simply click on the link, take 2 minutes to sign up for a free account and literally start making money in the next 2 minutes.
And by the way, be sure to play their daily game, ClixGrid where as a free member you'll get 30 free chances daily to win up to $10 which is added immediately to your Clixsense account!