I haven't seen a whole lot of iPad art books on the market, so I don't have any to recommend yet. If you know of any, let me know!
Illustrator friend Will Terry, who has work featured in the iPad For Artists book, has a video tutorial series called Painting on the iPad. He also posts a lot of advice and process videos on his YouTube channel.
I do not have personal experience using an iPad Mini, but I can offer a few thoughts:
First, the iPad already has a shortage of screen real estate. There's not a lot of room for menus, tools, let alone your art. I can only imagine that it is even more cramped on an iPad Mini.
Second, iPad styluses tend to have wide tips and are not as accurate as normal pens. Drawing with one on a small screen is only going to amplify how "fat" the stylus feels. You may be in for a frustrating experience.
Also note that the physical size may change how the sensors and sensitivity works between the iPad and the iPad Mini. Because of this, you may run into stylus problems, such as the tip being less sensitive or less accurate. Some of the fancier styluses that require electrical signals or feedback may not work at all.
Other than that, I don't think there is much technical downside between the iPad models. All the apps should work the same. Most styluses should work just fine. I know there are artists out there that are using iPad Minis for making art with no trouble. I think the decision will ultimately come down to your own personal preference, and what stylus you like to use and if it functions properly with the Mini. Check the stylus manufacturer's documentation about the iPad Mini, and if you can, try to test out a Mini in person before committing to a purchase.
The TruGlide Apex stylus is the second iPad stylus I have tried that features a fine point tip. The other was the Jot Script by Adonit. Unlike most fat-tipped tablet styluses you'll find on the market, the TruGlide stylus has a tiny 2.3 mm tip that makes it feel more like a regular pen.
The technology that makes this possible is a powered electrical signal that detects the pen tip on the iPad screen. That means the pen needs a battery, and you have to turn it on for it to work. For the most part, the TruGlide worked well, but there were a few bugs. Read on for the full review!
The Jot Script is the first major iPad stylus to feature a fine point tip. No squishy rubber. No awkward plastic disks. No kidding.
I honestly didn't think it was possible with current iPad technology to create a stylus with a true pen-like drawing tip. The Jot Script has proven me wrong. The stylus comes from Adonit, known for their Jot Pro and Jot Touch styluses. Those models feature a ballpoint pen-like tip with a plastic disk attached to the end, which made them pretty accurate compared to their competition. The Jot Script takes the innovation even further, ridding of the disk altogether. It uses an electronic signal instead of plastic to communicate the "finger" touch on the iPad screen. But is it too good to be true? Does it perform as advertised?
The Wacom Intuos Creative Stylus is a pressure-sensitive iPad stylus from arguably THE foremost maker of digital styluses and drawing tablets. They had previously released the Bamboo iPad Stylus to good reviews, but the CS is the first iPad tool from Wacom to feature pro features, design, and connectivity. It was not the first pressure-sensitive stylus to be released to the market, but with the company's reputation for great art pens, this stylus was highly anticipated.
I personally don't think the CS produced anything groundbreaking or new compared to the few other pressure-sensitive styluses that have been produced so far, but it is solid and performs well. It stands its ground against its competition and is one of the best styluses you'll find in the market so far.