setup lun and volums best method

For most users, it is better to set up network shares (using SMB), and not to use iSCSI LUNs.  Do you have a specific reason why you are wanting to use LUNs?

Either way, one thing you be aware of:  RAID is not enough to keep your data safe.  It's great for routine disk failures, and it does enable expansion of the volume later on.  But RAID arrays can fail (as can the NAS itself).  So you should make sure you put a backup plan in place.  The simplest approach is to use USB drives.

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LFX1 wrote:

I know in a raid1 mirror this will give me roughly 3TB, but after that, create the LUN, then when I create volumes, etc, but little gray on the volumes, are considered drives or storage volumes? 

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A volume amounts to a virtual disk.  The NAS assembles the volume from the disks using RAID, and then puts a file system on that volume (BTRFS in the case of an OS-6 NAS).

Then you create network shares (or possibly iSCSI LUNs) on the NAS, which are accessible over the network.

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LFX1 wrote:

So it appears you can carve out a volume and run an app in that volume like a service, can someone clear this up for me, and if possible give me some best practices. 

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The NAS is a specialized PC that runs linux.  Your model uses an ARM processor.  One limitation it has is that it doesn't have a lot of memory.  So you can run some apps, but you do want to be selective about it.  

You also should keep the volume quota feature disabled - although it is useful, it will take up memory on your NAS, so I recommend keeping it off.

To your question:  The NAS apps are installed onto the data volume.  The storage is in a hidden folder that you don't normally see.  One popular one is called Plex, which is used for streaming.  There is alternatively a built in streaming server called ReadyDLNA that you can use.  There are also some cloud apps available (dropbox, google drive, and some others - including Netgear's ReadyCloud).

Some apps will need you to create shares on the NAS for them, and some have their own web ui.  Most of the apps come from other users, not from Netgear.  Some work better than others; it's a good idea to search here for information before you install.  You can do that with google search, just add site:community.netgear.com to your search string.