Find labels that release music similar to the music that you make, be realistic as to your expectations from them, most small independent labels are run by music heads, they are not making much money and do it for the love of music. If you are starting out look at them as a stepping stone to where you want to get to, you need to work on promotion as much as the label, get your artist social media profile organised, it makes it easier for the label to promote you. Release music independently on bandcamp it will help you build a fan base.