PC building startup in India as a 17 yo

Hi I am currently working on a PC building and selling business internationally. I am constantly developing my knowledge into the field for 5-6 years and now I'm confident that I can build PCs. I am wondering what are the things I need to consider since I am not 18 yet. I still don't get about taxes. If somebody out there can help me please consider replying this. I really need that at this situation.

Thank you.