i just bought an amp too kekekke...but it's on layby, not enough money

anyways...
firstly how many rca channels are you running or have avaiable from your head unit. if you have only one channel then you will need y splitters, unless your sub amp has a rca bypas output(basically rca sockets which send the same signal out as that which you send so that you can use for another amp .sorry for lack of more descriptive words, just came back from an exam so my brain is dead...

)
if you only have the one channel then just get y splitters it's the brown and orange thing in the below pic...
for the power you could splice but best if you get a power distribution block, you can get one from jaycar for a few dollars..
and remember to upgrade the fuses accordingly, you don't want a fire now kekekeke
if you have any more questions just ask away....
Huy