It's a common saying that everyone has a book in them. But your response may well be "who'd want to read it?". Still, why not give it a go? It's not like you have anything to lose!
If you're an expert in a particular area then why not start with that? You may not think that anyone would be interested in how you built a successful plumbing business but I can assure you, there are thousands of people who'd like to be in your shoes so they'd pay good money to find out how you did it.
However, if you fancy your chances with writing fiction then it's probably best to stick to a genre you know. If you spend your time reading crime thrillers then you may struggle to turn your hand to romance.
- Make a rough outline of where you want your story to go. Where do you want to end up? There is no set rules to say how in-depth this should be but if you're just starting out then it would probably help to have a reasonably detailed plan.
- What sort of characters do you want?
- Think about how much research will be needed. Fans of historical novels will pull your writing apart if there are too many inaccuracies.
- Show drafts of your book to someone you trust. Get their honest feedback.
- Chose your media. Computer or pen and paper - there's no right or wrong, just chose what's best for you. But don't forget to backup if you're using a computer!
- Get started. Even if you delete it later, just get going. It's easier to edit what you've already written than look at a blank piece of paper
- Rewrite. Don't worry or give up if your first draft isn't great.
- Don't get too distracted by emails or social media. Switch off all notifications if you're using a computer.
- Determine when you're most productive and work then.
- Set deadlines and goals but make sure they are realistic. Writing 2000 words by midday is a great goal but you may get disillusioned if it doesn't work out. Set the target at 500 and you'll get a boost if you exceed it.
- Take time out. If you can't get writing then take a break.
I don't know you said this originally but good advice is to write the book you'd want to read. Good luck and get writing!