Your best bet is to watch some YouTube videos and visit forums around the internet that pertain to reloading. Iraqveteran8888 has some great videos (
) about reloading. Just take it slow, don't make any quick decisions about your first press\dies\supplies until you read up on everything. Thankfully we have the internet where we can find out from others what they've bought and found they need and don't need, and you'll be quick to see there's a lot of stuff out there you really don't need.
As nraynes said, if you shoot 100 rounds a month, say it's 9mm or .223, you will not save money. If you're shooting 168gr FMMG .308 @ $1/ea, you will save money quickly; I reload that cartridge for $.40/ea.
However, look at it this way: reloading is another hobby you can add to your list of hobbies. Not only do I find it enjoyable, I find it relaxing and very satisfying to know the round I just made a .25" group @ 100yds with, I spent 3 months tweaking. It's my round, tailored for my rifle and it may shoot like crap in your rifle.
For a quick price breakdown, let's say you were going to reload that 168gr .308 round I make, based off my start up costs.
Lee Anniversary Kit - $100
RCBS .308 dies - $50
Portable workbench - $50
RCBS powder trickler - $15
Calipers - $10
That's it.. the anniversary kit comes with almost every you need, minus the length guide for the case trimmer ($5) and a shell holder ($3-5). The scale and powder measure suck, but they do and will work for the time being until you figure out if you want to buy better equipment. Some might suggest starting with a higher end kit, such as an RCBS Rock Chucker, but should you decide you don't like reloading $100 is easier to swallow than $200-300+. You don't need a tumbler either to start out, use Dawn dish soap to soak\wash the crap off the cases and bake them at 250F for 15-20 minutes to dry them. If you want super clean cases, use the shell holder from the case trimmer, chuck it in your drill, and use 0000 steel wool and maybe some brass polish with a cloth. It won't look as nice as a tumble in stainless steel media, but it also isn't extremely expensive.
On to supplies for the bullet:
1lb Varget Powder (enough for 160 rounds) - $27 (at store rate)
Hornady 168gr BTHP per 100 - $33 (at store rate)
Federal Match Primers per 1000 - $43 (at store rate)
As for cases I usually use LC brass I've taken from the Ultramax bulk packs. I don't include them in my price, but so far at basic store prices each round is $.54. Buy in bulk like I do from somewhere such as Powder Valley, and you're down to $.40.
That means to break even on my initial cost of $200, I need to shoot ~325 rounds. Shoot something that's semi-hard to find like .300BLK, .458 SOCOM, .50 BEOWULF, .50AE, or the big-boy .500 S&W that's $3/ea, you will break even much sooner. Even in .40S&W, I'm reloading for $.12/rd where commercial ammo is $.32/rd.
Now here's the alternative side. If you shoot .223, it will take roughly 1,500-2,000 rounds to break even. Shoot something even cheaper like 9mm, and you may never break even.
You may not still be following this or have already made your decision, but if you are and haven't, I hope I provided a little something to think about.