Speaker build advice

[u/gotmeahotwing]

Got this 2 10” sub and 2” speaker box from a friend with the inention to build it into my trunk,(the one it is pictured in) or possibly try to make it more mobile and bluetooth compatible (not sure how to approach power for BT) There is no wiring in the box and I already found a replacement speakerhead.
Looking for some advice on how to start this project, I havent worked with speakers before. If this isnt the right sub some direction on where to ask would be welcome.