Fill the holes in the planks with a water putty dyed to match the character marks. Do this so that the marks are still visible. It will eliminate the voids where the dust and dirt will otherwise collect.
Let the putty dry for one hour.
Sand the putty off with a palm sander to clean the dye off the face planks.
Sand the floor with a box sander and three grits of sandpaper. Start with 60-grit and work up to 100-grit. Sand with the grain using smooth even passes. When the floor is smooth, vacuum up as much of the dirt as possible.
Attach tack cloth to the bottom of a broom and sweep back and forth until the floor is spotless.
Keep a wet edge and you will get a pretty even coat. Let the sealer dry for one hour.
Apply the polyurethane using the same method you used for the sealer. Pour it on in rows and mop it with the grain of the wood. Remember to keep a wet edge, as it dries slowly.
Note: You can use water-based polyurethane that takes two hours to dry or oil-based polyurethane that will take eight hours to dry. Ask your supplier for samples of different finishes for the type floor you ordered.
Once the polyurethane dries, go back over the floor between coats with a sanding screen on the box sander. This will rough up the polyurethane so that the next coat will adhere.
Put appliances back in place and hook up the connections. If you have an island put it back in place and hook up the connections. Finish off under the cabinets and the island with quarter round.