[relaxed state]

1. Getting a VPN that doesn't keep logs would be ideal since you will be doing multiple places and just doing this once could get you hemmed up if you mess up somewhere but you've already gotten your first item done so you are on the right track.
2. I'm not sure how Spoofs work either (Shouldn't be hard to do with a little bit of searching around). You should be fine with just using Google Voice since you can get rid of that # you used and grab another of similar characteristics. Creating a gmail acct just for voice, not connected to anything, is also a great idea to keep yourself safe.
3. There's a few houses around me that are "empty/foreclosed" so I just get the packages sent there under a fake, realistic/kinda generic, sounding name. You could try adding extra #/letters onto your apt name or something but I highly suggest searching up vacant residencies around you and using those instead of your actual address b/c there's no room for error when using your real address.

1. I only use the same method(s) if they permit, such as a product made by multiple companies with similar characteristics. IE: A Drone
2. This method works but there is no one size fits all answer for every company because many of them haves different policies and terms & conditions. You will need to do your own recon for that information IE: Calling up or emailing the company under an inquiry guise then implementing it into your SE.

Getting an encrypted email account is also a great idea
Always remember to "Stay Paranoid" (Dbl, Triple, Quadtuple check) while doing this type of thing.
2 other things to remember, get your shit in bulk or just for yourself at first b/c even if you decide against scaling your SE you have what you want for yourself already and can avoid being greedy or overconfident, which are the biggest 2 things that gets anyone doing illicit activities hemmed up.

Godspeed ahead kind human.