Most fans (balanced or not) come with a balancing kit of lead tape. You can also just use small washers or pennies and tape or super glue.
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You can buy replacements at Home Depot or Lowes. It's worth doing that because they come balanced. Even using the best plywood you may have to make 6 or 8 to get 4 that are close enough in weight to work right. I know this from experience. The replacement blades are packed so that they all weigh very close to one another and it only takes the weight of a penny to throw the fan off balance so that it wobbles and makes enough noise to keep you awake at night. I know this from experience.
I would use a cabinet grade, 5 ply 1/4" plywood. Birch if you want painted blades or the wood species of your choice if you want a stained wood finish.
Absolutely; that's what the originals almost certainly were. They were also simple flat blades, not airfoils or twisted or anything complicated. Actually, it might be worth asking the manufacturer how much a replacement set would cost. As caarntedd points out, unless you have the brackets attaching the blades is going to be a bit complicated/annoying. Again, unless you want to contact the manufacturer about spare parts.
Do you have the metal brackets that attach the blades to the motor?