If you want to learn, as @carl_g suggested, start with pistol... you are likely going to get into less trouble and generally far more straight forward. You are generally not trimming brass, cleaning primer pockets and very seldom if ever dealing with stuck cases in dies. At the same time, you are also not forced to lube every one of them.
The problem is, reloading common ammo like 9mm today, really is not going to save you much when you factor in time, unless it is for oddball calibers that you are going to have issues finding in store, say 9mm Makarov, 38 Super Comp, 8mm Nambu, 45 GAP.
With Rifle you will absolutely save for match grade ammo.
For instance, two calibers I am working with now, 6.5 PRC and 300 PRC...
Factory Ammo - $40 per box (IF you can find in stock).
Brass - From previously fired ammo.
Bullets - 147 Grain Hornady ELD - $.30
Powder - 60 grains of powder, H1000 $.23
Primers $30/1,000, so $.03
All in materials you are $.56 vs $2 per round.
You do have to factor in your time, hazmat fees if getting stuff delivered, etc.
You also have to factor in whether you are going to be shooting more or the same. For instance, went out to the range to merely do some load development for the guns, 308... that was 100 rounds, 5 boxes of ammo... versus would ordinarily shoot half of that?
Hopefully that answers the why it's cheaper per round but more expensive in general.
Then you have the issue of chasing performance.
When you start going into the brand new brass, $1 per piece, solid copper bullets with a high bc $1 per round, then powder and primers... you are paying more than regular match grade ammo. This does not include more expensive goodies such as electronic powder dispenser $300, case prep stations, match grade dies, precision scales, etc.... and oh yes, lots and lots of lube... (For the brass, not the other place).
So when you get to shooting and you feel like your ammo is holding you back, then reload. It is well worth it and educational and will make you a much more knowledgeable gun owner... BUT don't kid yourself, you will be spending more money net net as you will be shooting more and most stuff just won't be good enough for you anymore.
Cause after the precision ammo, you will want precision guns, $3,000 optics, $300 bipods, etc.
And oh yeah, you need a chrono... for real. I use the Competition Electronics Pro Chrono Pal, just dropped to $86 on Amazon and well worth it. https://amzn.to/2JTkd9p