All the goofy stuff aside,
You should probably start with RIM FIRE rifle.
That is like the .22LR (.22 caliber Long Rifle)
Cheap to shoot, don't have to pick up your brass since they are not reloadable,
Very little noise so it won't bust your ear drums,
Cheap ammo so it won't bust your wallet,
No recoil so it won't bust your shoulder.
Accurate out to about 50 yards off the shelf and a real blast to shoot!
Ammo runs about $5 for a box of 100 fairly good quality cartridges (CCI Mini-Mag brand)
.22 WMR (.22 Caliber Winchester Magnum Rifle, also just called .22 Mag a lot of times)
This is a rifle with some range to reach out to about 100 yards out of the box.
Ammo is a little more expensive, but for the extra range it's worth it.
This is an EXCELLENT small game rifle and fun to shoot on top of it all.
The new versions of rimfire rifles are the .17 M2 (.17 Caliber Mach II)
This is a .22 long rifle case necked down to .17 caliber bullet, and like the .22 LR, they are a blast to shoot, accurate out past 50 yards, but the ammo is somewhat expensive right now.
.17 HMR (.17 Caliber Hornady Magnum Rifle)
These are a .22 WMR (magnum) rifle case necked down to accept a .17 caliber bullet, and they are accurate out to about 100 to 150 yards, depending on what the weather is like and what ammo you are using.
Rounds are expensive as far as rimfires go, about $13 to $15 a box of 50.
If you decide to take on a rifle, get yourself a rim fire in one of these calibers and LEARN TO SHOOT CORRECTLY before you buy a center fire that is going to recoil and make you flinch...
Once you have mastered getting your rifle to steady,
Getting your trigger finger and eyeball to work together,
then consider getting a more powerful center fire rifle...
I still practice with a pellet rifle in the basement, and I burn up lots of .22 Long rifle and .17 cal rimfires at the range to keep my eye and hand working together when I drag out the big bore rifles.
If you buy something big to start with, all it will teach you is how to flinch and miss the target...
And once the flinch reflex is learned, it's VERY HARD to get over doing it!
Starting kids and women out on large handguns or booming rifles seems like fun...
But all these people are doing is teaching those women and kids how to flinch for the rest of their lives....
So,
Buy your self a pellet gun you can practice with indoors, when you can steady that gun, and control the trigger well enough to shoot one hole groups at 25 feet or so,
Then move up to a small bore rimfire rifle...
Once you have that small bore mastered,
Move up to some kind of center fire that doesn't abuse your shoulder or the muzzle blast make mush out of your brains every time you pull the trigger...
And learn to focus on the target, not the recoil or muzzle blast, you will do just fine!