Hello, total newbie here

So, I currently have a Roland cube 15x amp, a Boss RC-lopper, and a g1xon multi-effects pedal. These are currently powered by AA batteries. I'm wanting to get a Boss BD-2 and also a compression pedal (not sure which). I reckon I also need a power supply, because I don't want to eat through batteries. Any recommendations for something that will fit most pedals, in case I want to buy more pedals in the future? Will I need anything other than an instrument cable going from my guitar to the first pedal, cables in between, and a cable going from the last pedal to my amp?
Thanks in advance.