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.