Welcome! I hope you stick around to learn all you can.
First things first, we are pretty much united around here on the "alpha" nonsense as being just that-- nonsense. The dominance theory has been disproven over and over as ineffective and based on bad research and misinterpretation of wolf behavior.
All that being said, I would encourage you to do some research on why "actin alpha" can actually be hugely detrimental to your dog and why it's really an unfair tactic to use, especially given the fact that you have only just brought this dog home.