There are many writing jobs available on the Internet and as long as you have a strong command of the language you plan to write in, you've already won half the battle.
You need to build up your portfolio before you can go applying for one.
Jobs will come to you once you have built up your reputation online.
You can create a blog and post your daily rambling there.
You should still be creative with your blog post even you did nothing interesting in that week.
Try to apply to become a guest post on another blog.
It can be hard to get into but you can present your blog as part of your resume.
Posting on another blog will get more readers to notice you.
You can write articles and submit them into articles directory like EzineArticles.
Consider this practice to polish your skills.
Your articles will get more attention when posted online.
In return you will get more attention to your writing skills.
Post at least once article a week into those article directories.
After building up your portfolio, you will now have some sample work to show your credibility.
The easiest way to find a writing job is to look at those freelance websites.
A great place to look for writing jobs is at the ProBlogger's job board.
Some freelance websites lets freelancers to bid for the customers work.
Others offer the job as a first come first get basis.
You can find a lot of job in freelancing websites.
Complete the job well enough and the customer will automatically come back to hire you again.
Other times people will notice you from the blogs you have been posting and would want to hire you to write blog post for them.
It is different from guest post as you are require to write blogs post as frequent as once a day but you will be compensated for your effort.