Lots of scenarios, I will give you a link to a good overview if you'll answer some questions.
First thing I want to tell you, just keep this in mind as you eventually do this:
1. turn off your PC. unplug it. open it up.
2. plug your new SSD in with a SATA cable.
3. plug in your pc. reboot your PC.
4. Let windows install the SSD drivers automatically in the "Found New Hardware wizard".
This way you have the SSD drivers installed in your OS partition.
A bunch of questions:
1. what is your current OS?
2. do you have your current OS installation disk?
3. how big is your primary partition? (usually your C: drive)
4. DO you want to transfer your current OS to your SSD?
OR
5. Do you want to do a clean install of your OS on your SSD?
6. Do you own any disk imaging software?
7. DO you have more than one partition or HDD or do you have external storage to hold any files/music/documents etc temporarily?
Basically, you did right by asking first to plan this out,
As per physically placing the SSD in your computer case, check to see if you bought an SSD with an adapter kit or not. It's just a piece of plastic that has the exterior dimensions and screw holes of a regular HDD and the interior seat to screw in the SSD. SSD has no moving parts so just about any cheap plastic adapter works as there are no vibrations.
You can buy them very cheap, companies like Bytecc sell them for under $7 Or less,
random example:
Bytecc
Internal 2.5" HDD/SSD Mounting Kit For 3.5" Drive Bay or Enclosure
Micro Center - Bytecc Internal 2.5" HDD/SSD Mounting Kit For 3.5" Drive Bay or Enclosure BRACKET-35225