Magento expert needed for 2 customizations of Deal site

I have a Magento site with a Groupon type "Group Deals" Extension added! Right now the design is set up to send a voucher/coupon out to all buyer once the deal has expired and deal is done via email with a PDF attachment as well. The database also has a login set up for each merchant that is selling a product through us so they can login and see sales and modify offers! 1: What I need is for the the voucher/coupon to be invoiced and sent out immediately after purchase via email to customer and then also stored in the customer's account database so they could log back in and re-print it at anytime if necessary! The coupon/voucher right now has very minimal data printed to it. It pulls basic info and a unique code to the coupon/voucher right now but I need it to pull graphics and fine print to the coupon/voucher as well! 2: I need to have the ability to have PRE-ASSIGNED codes/numbers that will be able to be added to the merchants database and then the system will print the codes/numbers to their coupon! They will basically give us a series of coupon codes/numbers that they will accept and cross off their list when the coupons/vouchers are redeemed! For example they give us authorization to sell vouchers with code# ABC100 through ABC150! The first coupon that gets ordered and sold from us online would have CODE #ABC100 Printed on the coupon and the second coupon ordered would have CODE #ABC101 printed on it etc. till it reaches CODE #ABC150! Almost like assigning a specific seat at a sporting event/concert to a ticket in a way. I need to know what files have been modified and basically I need a separate extension created for the database so It doesn't overwrite Magento's Core Functionality and doesn't interfere with other extensions or the ability to add other extensions!