I'm building a PC with a MSI Z77A-G45 and there's no wires that come with anything, I don't know which specific wires I need and where I can get them from, help?
All power wires come with the PSU.
All screws needed normally come with the case.
The Sata wires for HDDs or DVD are packed with the motherboard. Normally only 2-4. Sometimes the HDD comes with a sata wire. All of the sata wires are interchangeable just use the ones that fit the best (too long, too short).