Just got a new SSD installed into my macbook pro, how to use?

First boot into your old system. With the SSD plugged in to your system you'll need to run Disk Utility to partition the drive with GUID and format it with a Mac OS Extended (Journaled) partition. Then Shut down your mac and press the powerbutton again.

Immediately after hearing the Mac boot chime, hold down Command+Option+R – if you see the Apple logo you waited too long and need to reboot and try again.

When you see a spinning globe icon, Internet Recovery mode has been entered with a message saying it can take a while, a progress bar appears as the recovery functions are downloaded.

When finished downloading, you’ll see the “OS X Utilities” screen, choose “Reinstall OS X” to begin the re-installation process of the Mac operating system

Select the destination(SSD) and complete the installation.