Best bet is to pick up a reloading book. I have harnady 7 th, speers and Lyman cast handbook. The library is a good source for books also.
you tube has endless info good or bad there's plenty
for you tube based stuff I like ammosmith.com, iragveteran8888, hitchcock45,ultimate reloader to name a few......
When it comes to finding componants you just need to search. I ask everyone. I have accumalated a lot of brass, bullets and other odds and ends from asking older gents ag the club what they got sitting around. I have met many older shooters who now would rather spend time shooting than reloading.