"I want to buy once and keep in for as long as I can, so for example maybe buy one shot gun and maybe one rifle for hunting and one for target shooting and thats it," I remember saying that. Just make sure you buy a nice big safe. They multiply you know.
I'd be shopping around at different gun shops until you find someone who's helpful.
The Adler is ok but it's a bit awkward at times especially if you're shooting from a vehicle
A double barreled shotgun is always lots of fun, sometimes it's nice to have that second shot ready in a instant without having to cycle the action.
If it wasn't for the deer and pigs I'd say go a .223 such a nice thing to shoot especially for new shooters.
A .223 is perfect for center fire target practice because they get great barrel life and ammo is reasonably priced. Pigs can be taken with a .223 with the right projectile and a well placed shot.
I'm a big fan of the Remington 700, they're very strong action plus for me ot just made sense to stick with one model type as to have interchangeable parts even between different cal's
As suggested, the .243 is indeed a good all rounder but some states have a minimum cal for deer which is. 308 if my memory serves me correctly.
Another possible down side to the .243 as a first rifle is it may cause some new shooters to develop a flinch especially if you use some of faster 100 grain loads, you don't want to risk doing that to yourself. It can take years to correct a flinch.
Typically, people recommend getting a .22 as a first rifle to hone yoyr skills.
They are cheap to buy, cheap to run and confidence building. You can shoot them all day long without regretting it the next day and they require very little maintenance as the barrel will not require cleaning.
The .22 will still be fun to use even decades after getting into shooting. I still love hunting rabbits with mine.
If you choose to start out with a larger cal, try to buy the lightest weight ammunition for it that you can to reduce it's recoil as much as possible. This will help you get use to it without giving yourself a fright ( that's what will cause you to develop a flinch ) A decent gun shop should be able to help you with this.