If you want help on the nuts and bolts of writing a book, then getting it published, I can recommend the following resources.
How to get started writing a book
Writing a book is weird: you have to be both imaginative and disciplined. This guide covers everything from getting an idea, developing a plot, building your characters, and everything else. The result? You get to write a book that will grip and entertain your readers.
How to get published
The publishing landscape has become really complicated in recent years … but the good news is that the opportunities for new authors have probably never been better. These days, you can opt for traditional publishing, self-publishing, or even a mixture of both. Go here for more.
How to get a literary agent
If you want to be published traditionally (i.e.: via a major publisher like Penguin Random House or HarperCollins), then you will almost certainly need a literary agent to help you on your journey. This guide tells you how to get an agent, and this post gives you an up to date list of all the literary agents in the UK.
How to self-publish
If you choose to self-publish your book, you will almost certainly want to do so by creating an e-book and making it available via the Amazon KDP platform. Self-publishing is now a huge industry that supports huge numbers of successful authors. That’s the good news. The flipside is that to make a success of your book, you need to get really serious about finding and retaining your readers. A great starter guide to doing that can be found here.