Planning on a SSD, bought Mountain Lion. What should I do?
===

I own a MBP 13" mid 2009 running Snow Leopard.
Now, I just bought Montain Lion and haven't installed it yet. I am planning to get a new SSD to replace my optical drive.

I am wondering what I should do - upgrade to Mountain Lion on the HDD and then when I get the SSD remove the system from the HDD and install a fresh one on the SSD (is that even possible?), or just do nothing until I get the SSD and then install Mountain Lion on the SSD. (Can I do that without installing Snow Leopard first?)

I am really confused right now, would love an explained answer.

BTW
How can I use the optical drive as an external one after I get it out of the MBP?

Thanks!