I want to start a GPT or PTC site

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I am interested in starting my own GPT or PTC website, any ideas where i can get a cheap script from? i can sort hosting and the domain out, Is there anything else i need? Can i just get the script upload to my domain,and then add the PTC ads etc and off i go? or is there anything else? like is this just like making money on the side? or is it like having a job that i have to declare? All replys greatful thankyou