What size spanners do I need for brake pad.

Not too sure about the caliper bolts, they can range from 14mm to 17mm or even 18mm. It depends if they are hax head or allen key bolts. The bleed screws are genrally 8mm or 10mm. The front and rear bleeds may be different sizes so check that before lossenign bleed screws. Also use a flare wrench or at least a box end wrench and spray a penetrating lubricant on the bleed screws and let it soak. WD40 is good but PB Blaster is better.