My experience shooting guns in a nutshell, I've been shooting less than 10 times in my life. (Will be 21 this June) I've shot my friend"s Glock 21 & Glock 19. And my uncle's Glock 26. I put about 50-75 rounds through each. It was a real "goldilocks", 21 was too big, 26 too small. 19 was perfect. I'm planning on purchasing a 19 when I can. I intend to use it as my CCW, home defense and competition pistol. When I knew I wanted a Glock 19, I picked up a plastic blue training gun at a gun show. I know it isn't the real weight but I've been using a couple of my friends holsters to get used to carrying, drawing and getting on sight. It's not the real thing but I'm taking it step by step. When it comes to picking a self defense ammo, I have no clue what's good and what isn't. My question is could you give me a brief explanation on what "grain" and "+p" mean? And a few types of 9mm ammo for self defense you personally prefer. I've been an info sponge lately, so any info would be appreciated. Thanks.