If you want to learn how to reload you are going to have to put in the time like everyone and just buckle down and do some reading, video watching, and note taking.
Some people do things differently than others, and have different desires in their equipment and methods either from a convenience, budget, quantity/volume, quality standpoint… You can easily spend a couple hundred to start out or a couple thousand… just depends on what you want to do and how far you want to take it.
Here are some resources to get you started.
As far as brass… I’ve been collecting and saving my brass for over 2 years before I actually started reloading because I saw myself doing but never got around to it until recently.
I still have some factory ammo, and never had issues with brass from Federal .223, Federal M193/M855, PMC, PMC-XTac. That’s pretty much what the bulk of my brass is because that’s what I shot in the past.
Plenty of places to buy equipment, but more important is what do you want to buy.