Battery building for esk8 can be much more complicated than a lot of what you see on YouTube, especially since we have factors like flex and road vibrations that we have to accommodate for. There are lots of really good resources here for battery building, and by reading The battery builders club thread. You can learn a lot. There are lots of pictures, problems and solutions that you can learn a lot from.
Any questions you may have during the process are better off placed there as that’s where you’ll have experienced battery builders looking.
The biggest barrier to entry for esk8 battery building is most likely going to be upfront materials and tools cost as stuff like 0.2mm nickel strip, spools of good quality wire, the spot welder, and everything else you’ll need will cost you quite a bit. You can start by having a battery builders weld you some P groups so you’ll be responsible for series connections, BMS hookup, and any other wiring.
There’s only so much I can fit into one post. But give the battery builders club a good read. Its like 20000 messages, but scroll through it and take a close look at some of the pictures and mistakes others have made. They’re a great tool for learning.