cash pay and check pay no payroll

aloha! im reaching out to see if someone could answer my questions

ive currently been working independently doing odd jobs since  may 2025 and i want to ensure that im in the legal standards. Ive been doing after construction clean ups for a couple of companies , i have no employees. do i need to get a LLC or file registration for a business license , or am i able to track all my payments received through the year and when end of the year comes show that to my tax worker? am i suppose to file quarterly or semi quarterly like a registered business? im basically looking for help or a step-by-step guideline of how to legally work independently. i live in honolulu,  hawaii. please help !! mahalo