Presuming you do not have a lot of overhead cost you should firstly get compensated for your time. Try to estimate how many hours a job will take and then you need to set an hourly rate. Because you are just starting out, you need to gauge how your skills compare to the competition and set your rate according ly. Test the waters. Look at some freelance sites and see what jobs go for and determine your hourly rate from there. Once you have established yourself in the industry you can maybe find a niche and specialize and charge more. Play around with the hourly rate and see how much work you get.

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