Blue essence (BE) will vary depending on the account you have chosen to buy. Make sure you check the descriptions closely so you know exactly what you are buying. Some accounts will have just purely Blue Essence and others will have Champion Capsules you can open up and disenchant for your BE.
None of the accounts have been registered to any email address. When you receive your account you'll be able to register your own email address, change password. The account will be completely yours, it'll be like you made the account yourself!