GPT (get paid to) sites are paying you for various activities like completing offers (known as "Paid to Sign Up" offers) and signing up with various programs, making surveys, viewing ads, refer other members.
First thing is to create a new e-mail address (Gmail, preferably). Do not ever pay to get paid. This is a common scam known on the internet. Legitimate sites will never require you to pay for registration nor will they require you to buy an account upgrade to enjoy the full benefits of the site. If you will find any sites that will require you to pay or to buy an upgrade that is definitely not a legitimate "Get Paid To" site. Also, another scam is presented by these sites that are selling lists of GPT (get paid to) sites. This is something that you don't need because with google you can search and find those sites very easy.
The most interesting way to make money online is that one called "get paid to review". That means that almost any one of us can get paid for reviewing websites. Reviews are playing a great role in the decision making of many consumers when it comes to buy something. This is the reason why many companies are spending a lot of money on research market to understand what costumers think of their products. Get paid to review is very interesting because you get paid to tell your experience about a product that you've tried.
Another thing that you should look at when you are searching a GPT (get paid to) site is at minimum cash out. You should ignore those sites that require an amount greater than $10 because there are a lot of legitimate, honest Get Paid To sites that are now sporting minimums of less that $2. The next generation of Get Paid To sites do not even bother to put a limit on cash out amount. This means that you don't have to worry that you will leave your money behind in the site's hand and it is a much more rewarding experience.
Some of the most respected GPT (get paid to) websites are: Donkeymails, Hits4pay, NeoBux, OnBux. Donkeymails has a lot of offers with payout between $0.01 and $10.00 for reading and joining offers. This website offers referrals 5 levels deep so you can earn from your referrals, referrals and so on.
Hits4pay sends you daily e-mails. You are getting paid to see the ads from that mail. Pretty much the same as Donkeymails.