I have to agree the most important part is too have ammoIn the beginning I didn't have much and to get some ammo built up I started by purchasing cases of FMJ ammo. As time went on I would purchase hollow points (what ever brand or round you prefer) till I achieved an amount of hollow points I was happy with.
This way you can have ammo if something happens until you have the money to build over time the supply of defense ammo.
After I reached this point I learned to reload ammo, this put my ammo production costs very low, 4.1 cents per .45ACP, letting me practice more often without depleting supplies.
This is how I did it.