There are a number of primers out there to explain all of the ins and outs of the different methods, so I suggest doing some Google searching. Sporty's iPad Pilot News has a series of videos which are worth watching, and AOPA has some helpful videos, too.
All that being said, I understand the "I'm not computer literate" feeling, because that's me, too. Especially switching to an iPad after years fighting the Microsoft battle, I thought I'd be lost. But not so.
My personal set-up is the original iPad Mini (with WiFi and cellular and 32Gb) mounted on my yoke with a forpilotsonly.com iPad Navigator mount. It is nice because of the flip up cover, which acts as a sunshade when up, so that I've never had the iPad overheat (if it overheats, it shuts down). I have a reduced glare ArmorGlas glass screen protector from MyGoFlight--in my view, it is the best one out there.
I use Foreflight Pro, which provides for geo-referenced charts, approach plates, and taxi diagrams. That costs $150/year and is updated every 28 days. You need an Internet connection to update. For funsies, I added the synthetic vision for an extra $25/year, but I'm not sure I'll keep it when I renew--it's pretty basic and doesn't seem to be all that helpful.
To that, I added a Stratus II, to obtain weather, traffic (spotty until I have ADS-B Out), TFRs, etc. It has an AHRS, so I also added the Horizon app (a FF product), and as a backup AI, it provides solid attitude information in an emergency.
I run FF Pro on both my iPad Mini and my iPhone 5s (16 Gb). I rarely turn on the Horizon app on the Mini, but I mount the iPhone on the panel and use it as the backup AI. I find trying to use the Horizon app on the Mini, even in split screen format, somewhat disconcerting because of the yoke movement. YMMV.
So how usable is all this, and would I change things? First, FF is an incredible app, and they are constantly improving it. The moving map can be configured with the push of a button to show VFR (a composite of sectional and WAC charts), IFR (looks just like LCharts), roads, terrain. Even when I'm flying IFR, I often have the VFR chart up, just because I like it better. But if I need the IFR chart (such as to find an intersection), it's just a tap away.
The Stratus II provides the ADS-B In information (weather, traffic, and TFRs), and mounted on the side of my windshield with a suction cup, it works well--no external antenna necessary. The downside of the suction cup is that it comes loose if I climb more than a few thousand feet higher than when I installed it, so I can pretty much count on having to remount it right around 10,000' or so--and if I do that, it's stuck on there pretty solidly.
None of this is perfect, of course. A few days ago, for instance, I was flying to Durango to visit, when the Stratus showed (on the iPad screen) that it wasn't receiving any ADS-B towers. Well, that's because there are no towers in the mountains west of Pueblo and only one tower in the San Luis Valley, which it wasn't yet picking up. Although we have lots of ADS-B towers in Colorado, they're somewhat inconsistently placed. Yesterday, I was returning from the visit to Durango. Although I have the Stratus II wired to my panel to automatically come on when power is applied, it didn't, and I didn't realize it until I had been in the air for awhile. So I was getting nothing from it. When I turned it on, it worked fine. Why it didn't come on, I don't know. So that's a pilot error thing--I should have checked to make sure it came on.
But later in the flight, after I'd come down to 11,000' from 14,000' after crossing over Pueblo, the FF program suddenly closed. Since I don't actually navigate with the program, it was just a matter of restarting it. But such a shut-down while coming up to an instrument approach would be a bit disconcerting, as it would mean losing the approach plates just when you need them. I have no explanation why it shut down, as it did it on its own, and it started up again when I pressed the FF icon.
If I were to change things, it would be to have a larger capacity Mini and iPhone. When I replace them, I'll go to at least a 64 Gb Mini and a 32 Gb iPhone--maybe more, depending on what is available at the time. Right now, I see no reason to contemplate replacing my Stratus II, although there are newer versions. When I have ADS-B Out installed next month, I suspect the traffic info will be more helpful, too, as right now I only get that if someone else within a 30 mile diameter is broadcasting ADS-B Out, to trigger the ground transmitters. But I'll stay with the basic concept of getting my ADS-B In information with a Stratus and iPad Mini, as it seems to work very well, and FF is for certain an excellent, well supported charting program. Its extra features, which permit thorough flight planning and filing any kind of flight plan, makes it hard to beat. Then after the flight plan has been filed, FF sends a series of emails, first that it was received by them, second that it was received by ATC, and then the bees knees, one that tells you the expected clearance routing.
Sorry that took so long--hope it's useful.
Cary