Using a USB Enclosure
If you have a USB enclosure that you can put either the SSD or internal drive in, you can clone your internal to your SSD directly. It's a bit more efficient than pulling from the Time Machine backup. For full instructions, read this, but the short version is:
- Open Disk Utility
- Select your internal drive and click the restore tab.
- Set your internal as the source, and the SSD as the destination, then click the restore button.
Using USB Key & Time Machine
If you don't have access to a USB enclosure (although I recommend getting one — they can be had for $30 or less and are very handy to have around), then you can restore from the Time Machine by creating a Recovery Disk on your USB key.
- Download the OS X Recovery Disk Assistant, and follow the instructions to create a recovery partition on your USB key.
- Restart your Mac with the recovery key and Time Machine drive attached, with the SSD installed.
- Hold down option while restarting your Mac, and select the recovery partition as your boot drive.
- Choose the restore from Time Machine option, and follow the directions. Select your Time Machine drive as the source, and your SSD as the destination.