as a new player, you should learn how to fly before adding in all sorts of mods and tools to use, especially If you haven’t played flight sims before.
Simbrief is good if you fly tubeliners to set up your flight plans which can then be directly imported to the game. these can also be sent to VATSIM if you decide to get into it (which requires filed flight plans for most situations. I don’t use it, don’t quote me 
). Several of the applications you listed and even the FBW A320 and Salty 747 has a simbrief integration to import your most recent plan into the planes flight computer without having to alt tab
I haven’t heard of Volanta, but SimToolKitPro is very useful for tracking all your flights. They sound similar and between the major 3 flight trackers available (STKP, Volanta and one other i’m thinking of i can’t recall the name of in this moment) and they all look and function similarly. Useful if you join a Virtual Airline and need to keep an accurate log of your flights. It’s personal preference which one you’d like, but they all function relatively the same way. The added benefit is these maps have a map that lets you watch your little plane fly across the screen and search for airports, SIDs and STARs. I believe STKP has a simbrief integration.
Navigraph and the like is useful when you need to see what ATC is actually talking about when they say “Cleared 6 Left via GUNN Approach.” There’s plenty of guides on the internet to reading airport charts and utilizing these apps.
If you’d like to streamline, it’s possible to run all these apps on a separate computer on your network. SimConnect/FSPUIC allows for these capabilities (Depending on app compability) as these apps allow the sim to “talk” to these applications.
In my opinion, the ultimate “Core” set of apps would include:
- A Navigation app (STKP)
- Simbrief
- Airport Charts reference (Navigraph, i just use google)
- Self Loading Cargo or PACX (these simulate passengers if you fly tubeliners)
- Live ATC (VATSIM, IVAO etc)
Anything else just becomes redundant