The information provided you by Imoven is basically sound, however, let me "flesh out" a few things, OK?...
1. You haven't indicated the type of PC you're working with. It would be useful to learn whether its a desktop PC or a laptop/notebook.
2. Since you obviously plan to create your SSD as the new boot drive in your system, you have basically one of two choices...
A. you can fresh-install the OS onto the SSD and thereafter utilize your HDD as a secondary drive in the system. (I'm assuming a desktop machine so that you can internally-install the HDD in the PC case.), or...
B. you can clone the contents of your HDD to the SSD.
3. Should you decide on a disk-cloning operation there are three criteria that must be met...
A. The present boot drive boots & functions without problems.
B. The "destination" drive, i.e., your SSD, is non-defective
C. The disk-space capacity of the destination drive, i.e., the recipient of the cloned contents of the "source" disk is sufficient to contain those contents. So as long as the total contents of your HDD is not more than about 215 GB you could go ahead with the disk-cloning operation should you choose to.
4. In any event, if you decide to fresh-install the OS onto the SSD it's highly recommended (although not necessarily mandatory) that the SSD be SOLE drive installed at the time of the OS installation process.
5. And if you decide to pursue a disk-cloning operation with, of course, both drives being conneted during that operation, it is again highly recommended that IMMEDIATELY FOLLOWING a successful disk-cloning operation, you temporarily disconnect or uninstall the HDD source drive from the system and boot ONLY with the SSD connected. Capiche?
Assuming all is well with the SSD booting & functioning without problems, then you can reconnect the HDD as a secondary drive.
If practical, it's always preferable that the boot drive be connected to the motherboard's FIRST SATA data/port (usually designated SATA 0 or SATA 1).