You will be able to connect 2 of the fans to the motherboard directly, that excluding the cpu fan. There are 2 3-pin fan connecters on the motherboard and 1 4-pin connector. Just a quick question, do your fans have a Molex connector as well as the 3 or 4 pin connectors? If they have molex then you will be able to connect them directly to the PSU, although this can cause them to be louder as there is no fan control, but if not. Then you could either buy a 3 or 4 pin fan splitter that splits into 3 connectors, as this can be useful, but may limit the voltage that gets to each of the fans. Or you could buy a 3/4 pin adapter to molex connector, which can be connected to the PSU.
Neither of the cables/adapters are expensive, they can be...