Happy to help.

For phone number segregation you might consider something like mysudo, JMP.chat or Cloaked.

Some of these phone services also offer disposable emails too.

One thing I'd recommend doing if you're not trying to remain highly anonymous is registering your own custom domain name for all the email aliases you'll be generating. That was you can take them with you easily should you opt to switch to another provider or even self host if so inclined. (Addy.io offers their software as a free self hosted option).

It goes without saying that you'll need a robust password manager to keep track if all your unique account emails and passwords.