Yea, don't use regular sand paper for this!just buy the ebc hh sintered.
don't forget to sand off the rotors so they can wear in together with the new pads.
weak brakes for the first hundred miles is totally normal. do extra braking wherever you can, just don't rely on them too much and drive more cautious during that break in period.
I use the toilet paper my wife buys, it is awesome for pre bedding in new pads.:OWe always use sanding discs with the pneumatic orbital. It's not paper, it's the baked material like angle grinder discs have.