In general see there are tasks that u need to perform against the money that is promised for each tasks. the more tasks u perform more money u earn.
Then there is a concept of minimum payout. Once you have earned that minimum amount by completing tasks, you are eligible for payment.
Once you are eligible for payment you are issued your payment on the next payment cycle which is monthly in most of the cases.
There are freelance data entry opportunities available which are genuine, but u have to bid for them and compete with the wages and hourly rates. Regular data entry options are good but not very easy to find. I got a small list of some good options, see links section. Workers without experience start at $6.00 an hour and can go up to $11.00 an hour in larger cities. Experienced data operators earn between $7.50 and $17.00 an hour, depending on the field.
Also there are few home based transcription work, where in you get the data in images or audio form and u need to convert them back in text form and upload.
Here also you'd be competing against people from countries where the hourly rate of pay is a lot lower, so don't expect huge wages for such jobs, but still it might be good enough to start with.
Also there are sites that pay you to do specific tasks like posting something on a forum, signing up for a newly launched site, or answering few questions as a survey, filling up forms.. or similar stuff, and there are amount specified for each tasks. tasks are easy, small payout is decent.
here are some useful links and resources to start with: