A few thoughts on what everyone said:
Closed cell foam sleeping pads are much, much cheaper than the self-inflating ones, they are lighter and they never puncture. If you decide you need the extra comfort of a self-inflating pad you haven't lost much money on the closed cell foam pad, and you can probably still find a use for it somewhere.
You can make an alcohol stove from a drink can, and do your cooking with whatever pots and pans you have at home. The handles on household utensils interfere with packing and household utensils tend to weigh more than camping utensils, though. If you buy a camp stove, alcohol or gas cartridge stoves are easier and safer to use than white gas/Coleman fuel stoves like Whisperlites. White gas/Coleman fuel puts out more heat than alcohol, but this is mainly advantageous in winter or on long backcountry trips where it's necessary to carry many days worth of fuel.
Rucksacks/backpacks are for walking, not cycling IMO. They raise your center of gravity and are generally not comfortable on a bike. If you can fit all your camping gear into a big saddlebag that's great, otherwise go with panniers.