Sounds like you are off to a good start. Build over time and it is amazing how far you can go on the cheap. You don't need expensive MREs/freeze dried food to get started. Just being an INGOer, you certainly have the zombie-squashing hardware already handled.
I strongly recommend you listen to the following podcasts. They go well beyond what I've described- more in depth and into additional topics like documentation packs, etc. It is easy to get sucked into prepping hysteria, but The Survival Podcast is very practical and even-keeled. Very good newbie info.
Episode-1190- Holy Crap I Just Found Out Everything Isn’t Super – Part 1
Episode-1191- Holy Crap I Just Found Out Everything Isn’t Super – Part 2