Once you are committed to regular writing you need to think about how to improve what you write.
I was lucky to work with some great editors on Which? magazine who really sorted out my writing and helped me to eradicate simple errors. If you are working at home alone on your writing, work out how to get some feedback. Look for a mentor or join a writing class. I took a course in Journalism at City University and further writing classes at Morley College which I really enjoyed. You get to meet others who want to write and get feedback on what you do.
So, there are a couple of things that you could do today to get closer to having your own writing business. Firstly, think about your writing style. In Commercial Writing: How to Earn a Living as a Business Writer I have written a chapter about basic grammar which will help you eradicate simple errors from your writing yourself. If you have a book on grammar at home you could pull it out and have a look through. Then, because it is not always easy to improve your writing alone, check out courses at your local college to see if anything appeals for the Autumn.