I want to market my coin and want to do fundraising. please tell me how can I do this, how can I go for ICO/ IDO.
Build your platform first. You didn't even know how to browsing on the internet and then try to read some article related to it. Your garbage coin will never be in the market if you didn't have something to be offered as a valuable product.
Try to talk with yourself about that whether you have something to be offered to the investors or not. Just because you make a new token and it doesn't mean you can sell it and make it as money grabber