There are multiple ways (firearms, calibers)to get into learning how to shoot. The difference is in the cost. Both for ammo and the firearms.
One of the cheapest ways to shoot is with pellet guns. Pellets are powered by air. You have guns that you cock once and they compress a certain amount of air internally to drive the pellet. There are also guns that you can use scuba tanks to charge. They are called pre charged.(PCP) they can be pretty powerfull close to the rimfire cartridge .22lr.
Quality varies from gun to gun and of course the higher the quality the higher the cost typically. Some people like to tinker and will take a less expensive gun and make it into a much nicer gun.
I have a buddy who professionally modifies airguns to make them more powerful and more accurate and he has customers from Africa. The advantage of airguns for places that are very restrictive about firearms is that they are usually easier to obtain and the pellets are a lot less expensive than powder driven bullets.
I asked him and he said a good website is Gateway to Airguns.
The main thing is to learn the fundamentals of marksmanship. The fundamentals dont change from one firearm type to another. Just google “fundamentals of marksmanship”.
Good luck its a lot of fun and can be a lifetime pursuit.