Applying for SLPA jobs

I’m graduating soon and I’m starting to apply for jobs as an SLPA! Can anyone pls give some advice about how to pick/what to look for in a contractor? I see a lot of options for Sunbelt and Soliant? This will be my first job and I’m not sure how to decide with all these contractors… I don’t even know what it means to work with contractor in this context😭 can someone please help?