What you need is to bring the wood to a mill and have them mill it for you into interlocking planks with a smooth floor finish. Otherwise, you will not end up with a solid floor and the wood might splinter or warp.

Doing it yourself would require a planer and router, which would provide shockingly imperfect results compared to a mill.

on how long these are why would he need a joiner?A plainer for sure,just curious why a joiner though?

My bad I thought you had said joiner