It will take you weeks to get a gun in America right how. Forget about it and move on.
Bear spray or mace can be found at any sporting goods store.
for your first gun you should get a ruger 10/22 , it will teach you how to shoot and handle a gun without breaking the bank. every house needs one.
but you want home protection so that is a 12g shotgun… they are cheap and can be found anywhere. they kick like a mule, but killing people should make the shake all worth it.