Reloading is one of those past times that can produce many benefits...Even if you don't shoot a whole lot over the course of a year, you will find that you can develop loads for your rifle or handgun that surpasses that offered with factory rounds...
For those times when a type of ammunition is in short supply commercially, you have the ability maintain your own personal supply, usually at a much less expensive cost per round...
As far as basic mechanical items, you need a press, a set of caliber specific dies, a beam scale, a tool to seat primers, and a hand tool to deburr and chamfer the used cases...An inexpensive dial caliper is helpful to fine tune your overall length of rounds...The most important item is a good reloading manual that explains the whole process...Several manufactures offer kits at a very reasonable price that contain all the basic items...
There are a lot of items that help speed up, or assist in producing really high quality rounds, but they are nice to have, rather than "need" to have...
Some approach the reloading process with the attitude that the initial cost is not worth the 'savings'...I look at it as a long term business investment...Whatever your initial cost, I depreciate that over a five year period...Let's say that your initial kit costs $250...Depreciated at 5 years is $50 per year and your cost is gone after five (most basic reloading items will last a lifetime)...
If you have been saving your brass from previous shooting sessions with an eye to starting reloading, that is one expense you've cut back already...now, you only have to buy your bullets, powder and primers...If you watch for 'sales', you can save a bunch by buying more than you think you will initially need and have it on hand for future loads..
Years ago, I used to go through a thousand rounds per week in the weeks before a competition match...Now, I'm doing good to shoot a thousand per year...I have a goodly amount of reloading supplies that I've purchased at a much less expensive cost factor than if I went out and bought them today....