Hi,
As for number 2 & 3: If I understand you correct, you want to use two domains pointing to different pages in the same account? In a virtual account you are not allowed this per the AUP. This would need a reseller account. If you have a reseller account, I think you are good to go.
Otherwise you can have 2 or several domains parked on a virtual account, but they must point to same pages.