A reloading manual or two and someone experienced to ask for help go a long way. A friend on another forum gave me some pointers and would help me out trying to figure out pressure signs at first. After that you can find a lot of free published load data online and once you have loaded some you start to get an idea where you should be with different powders and bullets for a cartridge you have worked with a little. It’s easiest to select common components that are proven for a given cartridge when first starting out.
As far as equipment buy yourself some decent stuff to work with, if you end up being serious about it you won’t have to upgrade anytime soon. If you decide it’s not for you it’s easy enough to sell the stuff. A single stage press, scale, powder thrower, calipers, and some decent dies gets you started for the most part.
You will end up with a case trimmer and I would recommend some sort of dedicated priming tool to save yourself some time. Outside of the basic tools the things you buy additional are more about time savings, progressive press, power case trimmer, electronic scales, etc.
I load several thousand rounds a year with a forster co-ax, a forster priming tool, and a Harrells thrower I have dialed the process in as well as I can to be fast. I recently started loading progressive for some of it just to save time. The biggest upgrades I have added to my reloading equipment over the years has been a chronograph, a Giraud trimmer, a dedicated annealer, and now the progressive press none of which was truly needed at first.