Whats the M1 for? I get your advice, i just wanted suggestions. And shooting is expensive. Neither thought about how much ammo costs and all the other expenses. Are gun shows good places to buy weapons?
The M1A (or M14)is the updated, modern day version of the M1 Garand. Springfield Armory calls theirs the M1A, if made by any other company it is just called by it's military designation: the M14. The M14, along with the FAL, HK91, AR-10, etc. are considered battle rifles because of the large caliber rounds they use. Comparatively, rifles like the AK and AR-15 pattern rifles are considered assault rifles as they use a smaller round. Both battle and assault rifles are semi automatic, as opposed to bolt action which you would typically see on a hunting rifle or some sniper rifles.The battle rifles have a lot more range and stopping power, with the effective range of their bullets extending to 800+ yards, compared to 400 or so yards from an assault rifle.
I had to pick only one rifle to own for the rest of my life it would be a battle rifle, probably a FAL or M1A. That being said, battle rifles are not practical for home defense unless you live on a large ranch or farm.
Since you are looking for practical weapon for self defense, I would say that simplicity and reliability are the two most important factors. Also, since you are new to shooting it would probably be wise not to get something too expensive to buy or shoot.
Keeping that in mind, here are my suggestions:
Pistol:
-Glock or M&P in 9mm. 9mm is the cheapest full sized pistol round to shoot and you will want all the practice you can get. 9mm hollowpoints also expand only ~10% less than the much larger .45. Practice as much as you can, make sure your gun can run whatever hollowpoints you choose to get, then keep it loaded with hollowpoints for home defense. Both guns can be found for around $500 new. For home defense a tactical light mounted to the rail would be a worthy addition.
Shotgun:
-Remington 870 or Mossberg 500. Both are entry level pump shotguns. Simple, reliable, effective. If you plan to use it for home defense you might want to consider adding accessories like ghost ring sights, flashlight, shotshell carrier, pistol grip/collapsing stock, etc.
Rifle:
Ar-15 or AK-47. Despite having less range and stopping power than a battle rifle, battle rifles are simply not that practical for home defense and urban environments. And AR or AK will also run you a lot less both in purchase price and ammunition. the cheapest AR-15s can be found for around $600 and are infinitely customizable. You can pick up a Saiga or WASR (both AK pattern rifles) for around $400.
I personally am not that big of a fan of shotguns. For a beginning shooter I would say get a rifle and handgun first, but a handgun and shotgun would also get you off to a good start.
Whatever you choose, training is invaluable. Quality instruction on how to use your firearm defensively goes a long way. Also, if there is one I would advise you join a gun forum for the state you live in. Gun laws vary greatly state to state and you can get a better idea of what the laws are and what is available to you by reading things specific to your state.
Good luck with your purchase, and have fun!