Hi noobie here

Is it ok to use the same email address to dual box

i sent a refer a friend to a family member email address but heard this is not a good idea and will get a banned or something like that.

So i sent a RAF to my email address, the same one as my main battle.net account
so basicaly it asks to pick either wow1 or wow2 when i login

Is this ok to use RAF or do i have to use an email address thats mine but is not of battle.net



also should i use 2 of the same class and race
wanted to go hunter/warlock and also of different races
or does it have to be ie hunter/hunter of night elfs