Here's what you need and how I recommend that you proceed:
First, get the new SSD.
ALSO, get an external USB3 2.5" enclosure. Something like this should do fine:
http://www.amazon.com/Inateck-Inch-...=1465136812&sr=8-1&keywords=inateck+usb3+uasp
Next, put the SSD into the enclosure, and connect it to the MacBook.
Next, initialize it with Disk Utility.
NOW, install a clean copy of the OS onto the SSD.
When the installation is done (since you aren't keeping ANY files from the old drive), create a NEW user account and get it set up to your liking.
Next, DO A TEST BOOT with the SSD still in the external enclosure. Reboot and immediately hold down the option key until the startup manager appears.
You should see icons for both the internal drive and the external.
Select the external with the pointer and hit return.
Do you get "a good boot" ??
If you do, now's the time to power everything down and "do the drive swap".
When done, put the old drive into the enclosure, re-initialize it, and either use it for a backup or for whatever storage you wish.
I -STRONGLY SUGGEST- that you consider using CarbonCopyCloner to clone the contents of the SSD (once inside) to the old drive. You'll now have a fully-bootable cloned backup drive for those "I can't boot!!!" moments.
Final thought:
It's best to set up the SSD and get it running -externally-, before you put it inside the MacBook.
If you do it this way, and encounter any difficulties, you'll STILL HAVE A WORKING MACBOOK with which to go forward and correct the problems.
Much easier!
