Some survey websites post surveys as their available and allow you to attempt to qualify, others will e-mail you specific surveys which are targeted for you. On average I receive 3-4 surveys within the course of two days per survey site. Less for some, more for others.
Similarly, they all send out payment differently.
Some survey websites such as pinecone research send you a check immediately after completing each survey, so you end up getting a whole bunch of 3 $ checks.
Most paid survey websites pay on demand however. They set up a minimum payout, 10$ on most sites, and once you hit at least 10$ you can request a check at any time you'd like.
And it's not only okay to apply for more then one survey website, it's EXACTLY what you want to do. The more survey websites you sign up for the more surveys you'll get. What you DON'T want to do is to sign up for the same survey site twice, because then you'll be cheating the particular company by filling out the same surveys twice. There's nothing that says you can't sign up for different companies (different websites) however - it's something I do and I make a lot more money that way.
There's a list of survey websites on this website – http://www.thegrusueye.com - there's also a TON of tips on there as well as video tutorials which should help teach you the basics of using survey websites to make money.
Good luck!
paid surveys