Hi @RaiMuhammadArsl, I think you should first be a blogger and establish yourself as a brand then you should go for freelancing. By doing this, you will get an opportunity to showcase your expertise to your future clients and demand for higher pay outs.
If you are taking the entire content and pasting it, that will be a violation. But if you are getting inspired from their content and preparing BRAND NEW and FRESH content for your website is acceptable.
The more your read the more ideas you will invent for your content. So keep reading!
Also producing new content will give you an upper hand on search engines.
I hope this helps you.
P.S. I have changed the topic title.