The starting point may not be the same for everyone depending on one’s background but following are some suggestions:
1) The starting point could be some training.
Have you considered writing courses? Sometimes you can take courses at community colleges. Christian writers’ organizations often offer conferences. Search online for what is available. How much you invest time-wise and financially depends on how seriously you wish to pursue writing.
If you want to begin simply by reading, you’ll find some helpful articles and books about writing on the Church Communications Resources page.
2) The starting point could be networking.
Sometimes connecting with other writers helps spur you on as you see the journey they have taken to get to where they are today. Remember Proverbs 27:17 — “As iron sharpens iron, so one man sharpens another.”
Support and encouragement from other writers can be invaluable. From casual sharing with one another to deliberate mentoring, any kind of input can help you grow as a writer.
3) The starting point could be to simply begin writing.
Online blogs can provide a platform to share what God lays on your heart. You do need to realize that just because you build it does not mean people will come. You must promote your blog to secure readers.
You can write online and offline articles. Search online for article sites to which you can submit your articles to make them available to others. Writing for magazines is another possibility. Learn the requirements of the various magazines and send a query letter to see if they are interested in what you plan to write. Slant the article to match that magazine. If your church has a newsletter, they might be open to including an article from you.
Then there are books. You can go through a book publisher which can be a tough market to break into if you do not have a portfolio of writing or perhaps if you are not a well-known speaker. Getting articles published first enhances the possibilities of book submissions being accepted. Or, you can self-publish. If you do that, find a good proof-reader. Usually the more books you get printed, the less cost per book, though print on demand is becoming more popular and less expensive. The downside with self-publishing is that you might then need to do your own promotion and distribution.
The Christian Writers’ Market Guide provides contact info and submission guidelines for both books and magazines. (link goes to an affiliate store)
The starting point could include all three points mentioned above simultaneously.
Where ever you start, just make sure you begin. Diligently stay the course, trusting God to open doors and use your writing to His glory whether done professionally or in a church newsletter or personal blog.