If you're new to online work, but have a talent you want to promote, don't do it in the many gig sites. If you have a talent that you can monetize, skip the gig sites and make your own to promote your services. This way you get all of the money and you can have more control of what your services offer. Gig sites are great as a jumping off point, but if you can, make a website and find ways of offering your services from there instead.