Yeah both my fans are 4 pin connectorWithout having full specs on your fans, I suspect strongly that each consumes less than 0.5 A at max. Thus you can use a simple SPLITTER like this
https://www.newegg.com/p/N82E16812423160?Description=coboc fan splitter&cm_re=coboc_fan_splitter--12-423-160--Product
to connect two of them to the only SYS_FAN header you have. I am presuming that both case fans are of the same basic design (both 3-pin, or both 4-pin) and thus will be controlled properly with this signal sharing connection. That Splitter of 4-pin design will work for both thyes of fan.
I can't seem to find a splitter for decent price here in the UK.Yeah you only have a CPU and System fan header on that mobo. As to adding more fans you can either buy a fan hub or buy a Y splitter and do two fans off one header.