Some noob doubts before my first build

[EXTINTOR]

Hi everyone, I've always wanted to get into this kind of stuff and I recently decided to do so.

I would like to start with a pi zero project and for the last two weeks I've been watching and reading a lot about the Gameboy Zero. I'm going to use a Tinkerboy v2 pcb for it and I wanted to make sure I choosed the components correctly before buying.

Here is the list of components and the links where I would buy them (from Spain). Could you please tell me if there is something wrong or left? I just want to make sure everything is right (and mabey get some pro tips) before ordering since this is my first time ever doing something like this.

Tinkerboy
Speaker
Micro USB
Slide Switch
Female USB
Screen
Volume Wheel
Raspberry Pi Zero
Cables

I have not included the case and buttons on the list.

And some specific doubts:
Do I need any specific cable for some parts or can I use the ones in the list for everything?
Wich powerboost should I use? should I spend a lot of money on it or there are afforable options?
Wich battery should I get?

Thank you all in advance, I can't wait to get started.

[Spyder]

If you are in Spain check out the Kelboy. If I remember correctly they are based in Spain.

https://shop.lemoncrest.com/en/10-kelboy