You need to be expert which job you are looking for.First you need to make a portfolio about your service which service you want to provide.create a portfolio people can understand your service and whom need your service he can understand how expert you are.thanks for the service.
Starters don't have a portfolio, so when you are new i can advice the following.
Offer your service for a cheap price so potential customers, become customers.
From their try to build up a client base and expand your business.
Looking for an online work requires a lot of homework and commitment so that your application is selected amount the members from all around the world.
You cane try your luck at upwork.com or any other freelancer sites.