Heat sink is worth it if you intend to overclock your CPU. If you're getting the k version of that cpu, you can overclock, so consider it.
for ssd size, 128 is probably fine considering 256 is can be ~$100 extra. Windows 7 and a bunch of problems take up around 60 gigs on my computer; everything else is on the secondary hdd. But some people like to move games between the hdd and ssd for faster loads or w/e and larger sizes might be worthwhile there.
dvd/blu ray...maybe. dvd drives are cheap and even tiny cases have room. I don't think you really 'need' them anymore.
case depends on your preference and range. I have a fractal design define R4. It's a plain black box, super quiet, has dust filters, has tons of room for cable management (
). Downsides: it's wider than other cases I've had and there's a bright blue LED at the top that I cover up with some electric tape. All in all it's great. Again, some people like windows, strobe lights, tiger bites, typical gamer stuff.
If you've never done it before, it's helpful to have someone that has around. These days though, just watch a fuckton of youtube videos and you should be good, depending on the size of your case and the sausage-ness of your fingers.
yeah, building a PC is really very simple these days.
It's a lot of "put A in B" where nothing else fits in B, and A won't fit in B when it's the wrong direction.
