There are some legit things out there, double-check everything yeah!!
(Google name of the company, + scam and/or + problems etc or ask at related forums.)
I've only done online things for little amounts of money so far (like writing online reviews and such, it can be fun if you like the products or the music, it can be a lot of work for little money though) it may be okay to get some experience, there are some legit 'real' jobs out there too.. depending on your experience and perhaps specific knowledge too.. There are even some paid gigs for forum moderators and such.. (Again, usually you promote something or are part of a company.)
I read somewhere (not sure how accurate that site is) that data entry is sometimes not paid so well.. And some opportunities may be iffy-looking..
I know some people do medical transcriptions and it's a 'real' job.. Or transcribe legal stuff.. (you may need knowledge of vocabulary from those areas) Some people are also Virtual Assisstants.. (there are sites and blogs about this..) I wanted to do freelance writing (you can usually send articles by e-mail), you do need some peace and quiet for that, right now that's a bit unpredictable with the home renovations, might still do some.. I'm looking a bit into affiliate marketing too, it's important to find some good things to promote, that you can genuinely recommend..
Maybe you can find a few 'part time jobs' and it may be easier than one full-time? Or just try some things, but do research them well!!