To start a freelance graphic design business, what exactly do I need to do to start officially working and billing clients?

Question Details: Just as the title says, I am in the process of launching a freelance graphic design business. I have no employees or contractors. I am the only one in the business. Essentially, my business would work like this client contacts me and we discuss their project. I submit an official proposal/contract detailing the timeline, budget, specific deliverables, the terms for each party, etc. We both sign off on it, at which point the client would pay a non-refundable $50 deposit, with the other $50 to be paid after project completion and approval. Once it is paid, their deliverables will be sent and they will have full access to the designs. Does this sound correct? What specifically should be included in the proposal/contract? And most importantly, what do I need to do in order to set up and structure my business What do I need to file? Do I need an EIN? Do I need a separate bank account? Is there anything else that I need to know?

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