Help! New guy

[Imadad]

So this is post number one.
I recently picked up a 72 blazer. I talked to the owner alot before i drove to go pick it up. He told me that he knew it had holes in the floorboards. He knew it had "surface rust" on the rocker panels, but nothing bad.
Attached is the pictures of what I found. All the rocker panels are totally rotted through. the pans need replacing, and it appears even more does too.

I dont know the names of the pieces i need. I have looked online and seen rocker boxes, interior rockers, exterior rockers, etc etc.

can someone help me understand what to order, and how to put it together?

I have been thinking that it may be better to come back with some steel plate rather than factory reproductions, and then mount a reproduction exterior rocker over that to keep the same look. Can you share thoughts please?

Thanks! Glad to be here.