Hi David,
Welcome to the forums 
Yes, that’s normal for that camera the NoIR is short for No InfraRed filter. The normal version has an IR filter to prevent the purplish tint, but the upside of letting the IR into the camera sensor is much better low light performance.
Do you have a link to the specific one you’re using? I did a quick google, but I couldn’t find it. You’ll usually have to do some simple manual configuration to get those to work.
Re the car, this project is pretty similar:
And I recall Jim (@James46717 ) built a little Pi powered car a while ago for his grandkids to play with:
You can also get pre-built kits - so they’re worth a look at to copy. Core sell a few and you can get them from other places online too, eg.
If you’re just using the pijuice to power your Pi and will have separate batteries for the motors the standard battery will be plenty. If you’re trying to run everything off the pijuice, that’s a bit different. You probably could run everything off it like they do in that example project you linked, but it’s more a UPS just for the Pi. If you’re only using small motors and making a small cart like they are it’s probably fine, but if you want to make something faster/more powerful you might need to go a different route - so the short answer is, it depends!
Cheers,
Oliver
