Blogs are unlikely to be profitable nowadays for various reasons
Pic reated seems to be from 2010, so a bunch of these are not profitable anymore, but should suffice as a primer to get an idea what is possible
said for grunt work you will get outbid by people from places with lower living costs, that's why a lot of people working as online freelancers move to Thailand or whatever, cf "digital nomad"
In any case you need to have good motivation and organizational skills, and also learn the skills required for what you want to do, e.g. programming, writing, marketing etc.
So if you're serious about it do your research, there's a huge amount of resources dedicated to "how to make money online" though obviously they all also want to sell you something
If you have any specific questions or ideas we can then talk ITTIf I would have any business sense I would now attach a link to my blog or sth.