Wow, okay... let's see.
First, to clarify, FC HDD's are almost identical to SCSI hdd's except that the use FC. But FC and SCSI are very closely related and can be treated almost in the same way. FC is just a more flexible interface, but also more expensive and thus both standards are still alive. SCSI/SAS has its advantages as does FC.
Then, I do not know who pays your power bill, but don't be surprised to see it shoot through the roof. I do not know how "new" these disks are, lets say they are 2 to 3 years old. They will give you fairly decent IOps (no where near SSD speeds, need about 15 probably to reach that, still won't come near access time) but only poor GB's. Meanwhile, they use a REAL big amount of power. Where a desktop disk of 1TB would use in idle say 7 watts, these will easily do 15 to 20 watts a piece. Be warned!
So, if after heeding those warnings you are still wishing to use the equipment, let's continue.
Well, you could hook up a single HDD to the HBA and that should work. Not very effective, but still, it's all very close to SCSI.
Best thing to do is determine an array/storage box for it. This can be a box with a FC RAID controller in it which will allow you to make LUN's and then transport them through your HBA to your system, or this can be a simple JBOD box and thus leave your system to do the processing work.
A HP EVA is indeed an example of a storage box with RAID functionality in the box and in the case of EVA this is called a "virtual" RAID. It leaves less up to the user and just presents you with diskspace you can use. I am not a fan of this type of boxes because it makes things too stupid and sets you up for a fall in the future, my opinion and probably not really something you need to worry about at home.
A HP MSA is a more traditional box. Without controller you can hook it up to your system and see all the disks. With a controller it becomes an intelligent system which can RAID the disks for you and then present it to you.
What you need, it all depends on choices. Let me answer your switch question, that will clarify some more.
In most cases you are not required to have a switch to interconnect say and EVA with your HBA. In some cases I've seen, they might refuse to work together. Looking at the FC standard, this should just work.
Now, say you go with an EVA and a switch. Then you can buy multiple HBA's and put one in each system you wish to use storage on. This is the traditional configuration. Which is the most flexible, but also definitely the most expensive. 2 controllers are mostly used for high-availability. Since the disks are dual ported, each controller has a connection to it. Using dual paths to your host, if one controller fails, the other automatically kicks in and takes over. Not really needed at home I think.
Cheapest would be to buy a simple OEM box which can house your disks, connect that to your HBA directly and RAID the disks using software RAID on your host. No switch, no logic in the box, etc. For at home, a fine solution, just not boot drive compatible (probably, depends on OS). This could be your workstation which allows others to access the files using CIFS.
Or, you could build a dedicated storage box with something like FreeNAS or OpenFiler and then start using iSCSI to deliver the storage to the other boxes. This would allow you to use software RAID and not bother other systems with the processing power that takes.
Very many options, all dependent on what you want to do with it and how. Using these disks to hold movie files, etc. Don't even bother.... buy a 2TB disk, put it in your PC and you'll be much happier with the low power bill and low noise. I think if you would really run say 32 10K/15K FC disks of a few years old, it would cost you a 2TB sata disk a month.
If you indeed wish to run a hightraffic webserver, start looking at SSD's. Not saying this type of storage is unsuited for this purpose, on the contrary, just not that good for a "home" situation.
Hopefully this answers some of your questions. Let me know!
p.s. A warning. A HP EVA or MSA will *not* accept most other disks that are not HP branded or have HP firmware. Also blank caddies for unused drive positions are not provided, these are dummy caddies and cannot be filled with your own disks.