Over the years I've been refining my content writing techniques and I've learned what to do and what not to do. Content writing isn't exactly the easiest thing to master, but you can do it if you're motivated.
Becoming a content writer takes a few things
Drive - you need to have an internal drive that doesn't falter. You need to keep up with your writing even if you feel down. Stay on top of your work and you'll succeed sooner than later.
Motivation - Staying motivated isn't always an easy thing to do. If you feel like you're getting burned out, just take a break and go out to lunch with a friend or see a movie. In my experience I've noticed a good boost in motivation after 2 hours of break and doing something fun that actually gets my mind off of writing
Goals - You'll need to set small goals at first so that you can feel a sense of achievement. Small goals aren't something difficult to accomplish, but hitting them will boost your drive and motivation at the same time ;) I like to set small goals for each day and also weekly and monthly goals. I like to average 1 article a day, 7 a week, and around 30 a month. If I write 7 in one day then I'll have hit my weekly goal. If I hit 30 in a week I'll try to push for 60. And after that you can push your goals even higher
These may seem pretty basic, but basic is what you need to focus on when you're just starting out Don't focus on selling all your writings as soon as you begin honing your skills, focus on refining your skills first. If you have a garbage writing technique and try selling your content, you'll just hurt your reputation and it will be harder to recover from a bad review when you're a new writer.