Get a copy of The ABCs of Reloading. There are other "how to" texts but this is most often recommended to new reloaders. This one text will show how to reload, the equipment needed, and explain components. A very good start. I would not recommend any youtube videos about bullet casting or reloading. As a new reloader you don't know what is real info or what is BS, which I've seen a good bit of.
Some say they want to reload to save money, but while that may be true for some, most reloaders will tell you it jes ain't so, but you will shoot more. I have no idea what my reloads cost as my components' cost would be difficult to figger since I have powder purchased on sale from 1999, primers form 2006, and have no idea what I paid. I started reloading out of curiosity; as I emptied the cylinder of my 38 Special I thought "I wonder if I could reuse these?". In '69, way pre web, I purchased a Lee Loader and have been reloading off and on since (but fairly steady since 1988) and, IMO a major purchase(s) is reloading manuals. Most have good "how to" sections and charts and general info along with load data. A general/generic manual like a Lyman 50th Edition, a manual from a major powder manufacturer, and a manual from a bullet manufacturer will cover a great deal of info., most of what you'll need to get started.
I would highly suggest sticking with load data right from your reloading manuals, and ignore data from any forum expert, range rat, "they said", gun counter clerk, or gun shop guru. Get data from published manuals and if necessary powder manufacturers' web sites. You can easily find safe, light loads without going to extremes or doing any unwise modifications to your cases/cartridges.
Go slow. Double check everything. Most important, have fun...