For remote you can use pretty much any wire, relatively thin (12-16gauge). It runs from your deck to your amp.
I recommend you buy a set of RCAs with a remote wire attached to it already. That makes life easier.
Yes, the power and ground wire will come seperately when you buy em bulk, think of a big spool of wire, they cut how much feet you need. $2-10 / ft. They usually come in different colours, I usually get Red (+) and Black (-).