Question 1 and 2
You can use CrystalMark to bench your SSD, then compare that to the advertised speeds and see how things go. You do not need to defragment SSDs because all their storage can be accessed at the same time, if required (in theory), the reason for defragmenting hard disks is that the head can only read from one point of a drive, and if a file is randomly around the drive, it has to wait for the drive to spin round to recover each bit of data. You do not need to disable defragmenting.
This will involve editing your registry. If you are not confident doing this, it is not recommended.
1) Type in 'regedit' in the search box in the start menu
2) Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\
3) Find the 'ProgramFilesDir' registry key and open it
4) Change the value to the install location on the second drive (Assuming your SSD is C:\, the second HDD should be D:\)
5) Save the registry value and close the registry editor
These changes will not take effect until you reboot your machine, so remember to do that afterwards
Processor AMD FX-6100 Hex-core, 3.3GHz > Intel Pentium M 2.0GHz Single-core, 2.0GHz
Memory 8GB Corsair Vengeance DDR3 1600MHz > Hyinx 1.5GB DDR2 667MHz
Graphics Radeon HD7770 + Radeon HD5570 > ATi Mobility Radeon X600 400MHz Core
Motherboard Gigabyte GA-970A-DS3 Socket AM3+ > OEM Latitude D810 Motherboard Socket 479
Storage Seagate Barracuda 2TB SATA 7200.14 > Western Digital 80GB IDE 5400RPM
Power Supply Cooler Master Elite ATX 500W > OEM Dell Power Supply 90W
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