To earn money for surveys online there are a couple of things you will need to get started apart from just your opinion.
The first thing you will require is access to a web browser and an email address. This email address is used to contact you with a link to the surveys you are eligible for. If you do not have an email address simply type Googlemail in the search engine and get a free one with Google. I would recommend you use an email address just for online surveys and nothing else.
Next you need to find the companies that you will need to sign up with to earn money for surveys online. These can be searched for individually but with the time it would take you to find them and to check that they are legitimate I would strongly recommend against it.
Instead I would suggest you simply pay a small fee and join one of the paid surveys directories that exist. The directories will have a huge list of companies for you to register with and will have been checked to make sure they are a legitimate company.
I would suggest against using free directories as they provide very small list which in truth is not worth the time it will take you to use as the companies on it are merely after email addresses so that they can send you junk emails promoting their products.
To stand a chance of making any income with paid surveys I would say you need to register with at least 50 companies on their database. This can be tedious but in the long run it is not only worth but a necessity. if you really want to earn money for surveys online.