Joining the thread because it interests me, too.
I haven't published any NF apart from family history, and I won't claim to have done it 'successfully.' The only advice I can give you is, unless your book is fairly short, or would be completely ruined with black-and-white pictures, avoid using colour illustrations. Otherwise, your book will cost £49.99 a copy like mine, so you won't sell many! (I brought out a b/w second edition for £14.99, and an e-book version).
Obviously, for NF you need a level of competence/experience in your topic. The best advice I heard is not to try to write the one-and-only-Bible for your area of expertise, but to write a series of several shorter, in-depth books focusing on one aspect in detail. So, not 'Everything You'll Ever Need to Know About Beekeeping,' but 'Book 5: Preparing Your Beehives For Winter.'
It's certainly worth joining the 20 Books to 50K group on Facebook, if you haven't already done so.
I would say it is also worth setting up an author website, positioning yourself as an expert by adding info pages or monthly blog posts on your topic. Once you've written loads of these, you could combine some of them into your next books, so it's not wasted effort.
Obviously, you could add a page of listings for your books. Depending on the topic, you could also sign up for affiliate schemes to get a commission when you sell other companies' products, or if your area of expertise is a type of craft such as knitting, you could add an ecommerce shop selling your own products. However, any affiliate income relies on a large audience, so it's better tried after your site is more established.