3 words. "DO YOUR RESEARCH".

There are many users here that shared their ways of earning online. Now it's your time for you to make actions. Do some research, watch YouTube videos, if possible, find a mentor that will guide you. There are many ways to earn Bitcoin or any coin online, and if you will be doing it yourself and you're a newbie, you might get overwhelmed. Plan things first before doing it. Best way for me is to apply for online jobs and accept Bitcoin. Selling things will not make you earn coins especially if those "things" isn't what most of the people are interested with.

BTW, where are you selling things? I mean if that's the case then at least you have knowledge in digital marketing, right? You can use that skill to get clients online. Anyway, good luck to you OP and I hope you can start earning coins as early as now. The earlier, the better.