A blog itself isn't really a business—it's more of a platform for other income streams. Your content alone won't likely make you money. Instead, you'll have to get advertisers, sell services like consulting or speaking, use affiliate marketing to get a percentage of sales from links people click on your blog, or maybe offer products like ebooks or premium content to actually generate income. ProBlogger has an excellent post about these different ways you can make money.
I’m trying to get going for the minimum cost in the first instance. So, my question; is it possible to have more than one blog (or niche) attached to a single website? I have been advised it will cost around £250 for a basic WordPress site (once you have domain, hosting, theme etc). I have done a lot of work with small businesses as an advisor and specialise in marketing. I’m considering offering online courses and e guides. however, I would also like to blog about my hobbies of walking and motor homing. It’s just where to start!