Your mobo has 6 SATAIII ports, thats how your HDD is connected. So if you have 1 HDD, then you have 5 more free.
As for guides, yep, Youtube is chock full of them. Look here for instance for
SSD & here for
RAM. (General Idea How-To's)
As for the RAM itself, after you install the new RAM, simply hold onto the old RAM should you ever need it later on or you can sell it, though to be honest, you'd get very little for it, prob. $10 depending on where you live and so I'd suggest you just hold onto it should you ever need it later on. (Like if your new RAM fails at some point or a friend needs RAM)
In regards to $$, you're most likely going to need a little over $100. Prob closer to $135 after taxes. Both the RAM
@Karadjgne & I linked to would work great, the same for the SSD I linked to.
@Andyme177 had a good idea as well with the
WD Blue 250GB SSD