Before signing up and starting Paid survey sites, it is important to create a unique email address. Since many invites come directly to your email it is also important to check it as often as possible to make sure you don't miss out. I also recommend setting up a Pay Pal account if you do not have one , and make sure this email address is connected to your Pay Pal account. More and more companies are paying with pay pal which is much more convenient and faster than receiving checks. It is my preffered method of payment. Checks are nice too, :) It just usually takes longer for them to arrive.
Remember to complete your profile with each site and update regularly. The ensures that you get more invites and qualify for more surveys.
Also remember, legit sites never ask for payment or financial information. Generally they will ask for your address for payments and rewards and possibly your phone number for phone survyes (which are great, and pay well by the way!)