Your motherboard has 6 sata II slots. Also you will need one power cable for sata HDD from PSU (often one cable can support multiple HDD so you may have one cable with multiple sata power connectors).
You should have 2 sata data cables bundled with motherboard. Unless you used both (for example 1 hdd + 1 odd or ssd) you should have it somewhere. If no you just need to buy new one.