Windows 8 and new hard drive

Hi,

I just bought a Dell Inspiron 15 3537 and I am still new to laptops and windows 8 in general. I am thinking of buying a SSD drive to replace my current one.

Browsing through the net and then checking my device I noticed there is no product key. A small search showed that Dell includes the key inside the BIOS. What does that mean? If I manually reinstal windows 8 the key will automatically appear?

And a question about the recovery DVD: If I buy the new SSD and start my device, the recovery DVD alone is enough to install windows 8 on the new hard drive?

Thanks in advance.