The WE sparkling wine has you add 1 1/4 cups of corn sugar to their three gallon batch. I don't know how table sugar and corn sugar compare. If you PM me your email address, I can send you a PDF file of WE directions for their kit (VERY confusing to me!!).
Wade can help you with this too as he's done the kit...actually 2 of them together.
Sparkling Peach Chardonnay sounds wonderful! You can use a fining agent but you can't stabilize it or the second yeast won't work.
As for bottles, you HAVE to use champagne bottles. Regular wine bottles can't take the pressure. I'll bet there are a lot of them showing up at recycling centers...go stock up! You can reuse caps and baskets but they are cheap enough as to not be worth the risk to me.