Yes. All the service data from the EA will remain
Nope. All the data from the CBT will be completely wiped out and start all over at Early Access.
Yes, you will need to create the Steam account first in order to register Battle Carnival into your Steam Library.
You may want to visit http://store.steampowered.com/ to create an account.
Since this is CBT, we don't have any plan to sell anything until Early Access which we are planning to have around the end of April.
We'll update you about the Early Access schedule as soon as possible.
Battle Carnival is free-to-play, non-p2w online shooter. Everything you can purchase in the game wouldn't have any in-game stat bonus neither it will require you to play ridiculous amount of time to get ahead like leveling up some weapon cards to become stronger. It's not RPG, it's shooter. All characters are free-to-play so you will not have to buy characters including new ones. Come & compete fairly.
You can either click the here or click the red "apply for CBT" button on the main page.
If you cannot see the button, please refresh the main page.