Sabrina, calculate your cost for the 100 candles and work it out as a % of the estimated total bill for them, with the discount. Then ask that % as a deposit, prior to starting any work on the final order. Make sure that you spesify by what date they need to confirm payment into your bank account, taking into consideration the time it would take you to order additional supplies if you need it, as well as the time it will take you to make and wrap them. The balance is payable on delivery. Good luck - I'll hold thumbs for you:D