Well, first the bad news. You won’t be getting into reloading anytime soon.
Unfortunately, this is because unless you are on a first name basis with the Almighty himself and have his cell phone number, you won’t find any bullets, powder, or most importantly primers anywhere on His green Earth.
Reloading components are non-existant and all signs indicate that primers especially will be almost impossible to obtain for many, many months.
But to your question: What do you need. By “sizing” I assume you’re referring to case trimming. The dies resize the brass, but eventually it stretches and then needs to be trimmed. You generally will get several firings on each case before it needs to be trimmed.
You don’t need a polising tumbler and my father reloaded for 20 years without one. If cases got too grubby, he hand cleaned them.
You do need an accurate balance or electronic scale AND a powder measure. The scale is used to dial in the measure and after that the measure throws uniform charges that only need to be verified periodically.
You need a primer pocket cleaner and you may as well buy a stuck case extraction kit now. Sooner or later you will need one, believe me.
You also need a digital micrometer. This is a necessity for consistent loading.
Good luck.
Grouse