First Rule of Survey Taking:
Never pay them. They pay YOU.
If a site wants money from you for anything having to do with surveys, walk away. You're providing valuable research that companies are paid well for; those who try to get money from would-be survey takers are taking advantage of them, inserting themselves as an unnecessary middleman, at the very least. There's no part of survey taking you should have to pay for. Period.
If you try to sign up for a site that calls itself a survey site and you see pages and pages of opt-in advertising, that's not a real survey site. It's a poorly-disguised affiliate cash-cow that will probably spam your email account and try to get you to sign up for trial offers it calls surveys. This is another situation where you should just walk away.
Survey Police.com is an excellent, FREE database of survey sites, with user rankings and reviews. It's an invaluable tool for finding good free paid survey sites and checking the validity of a new site you might come across.
For those who would like a place to start, I offer my list of my best survey sites.