Is Hello@ a good email address?
As for the hello@, no it's not professional to use because it's impersonal. Companies use “hello@” when they want to mask the specific sender's account. Often, those hello or info accounts have shared inboxes where multiple people can answer. That's not the impression you want to give with your choice of email.
Should I use info@ or support@?
Do not use info@. That is an email address that spammers target. Instead, think of something more creative: hello@, contact@, letstalk@. Anything but info@, which will increase your spam levels exponentially!
What is a Hello domain?
The [email protected] address simply implies that when someone is going to send an email to that address, there will likely be a human on the other end. It's a subtle and friendly way to market yourself as a personable company with a personality.