Welcome to the forum, as Jamesey says, if you have an idea of what it is you're likely to be prepping for then you can work towards it. A first aid kit is a good place to start, you also need to think about food and water and whether you plan on staying put or relocating somewhere else, this will have a huge impact on how and what you need to set in place. Something to heat food and hot water for brews is good for morale too. Lighting and things like toilet roll also make life easier. If you know how many you'll be prepping for it gives you a number to work to, if you want to have a weeks worth for 4 people that's 28 days worth and again this might affect how quickly you can put it together.
Have a nose around the different threads and see what catches your eye, I have a folder on my desk top that I copy stuff to if I think it will be useful and want to refer to it, saves trying to remember what thread I found it in. Remember, you don't have to do it all in a oner, no matter how much you'd like to.

I think a lot of us have been guilty of getting caught up in 'having' to buy stuff, just start getting the basics and then when you're comfortable with the level you've built up and something catches your eye you can start expanding, and things will catch your eye, we all like the gucci toys.
Again, as Jamesey says, if you've got questions ask, there's a good chance someone on here will be able to give you pointers or at least opinions. Your preps are what works for YOU, not me or some American dude on Youtube although its good to see what others are doing. Enjoy.