You can edit the Experience rates inside ''../Script/Resource/DropExpIncrease.txt''. It's self explanatory what to do there. As for adding a GM account, it's explained in at least 3 tutorials in it's respective section of Iris, including mine. The same goes for the GM Tool.
As for the web shop, you need to figure that out yourself. It's an annoying process to do and time wasting. I'm not sure about this, but there was a guide for it on this forum somewhere.