Help! I need to refinish wood floors

Submitted to Community Café

I need help! I am preparing to refinish some oak floors in the flip house. The floors are not in bad condition and I think I can get away with a really good scrubbing and steel wool/stripping application rather than resanding them to prepare them for a new topcoat. 

Here's my question. What product can I use to put on top of them once the floors are ready for topcoat? And can I tint said topcoat a darker color to slightly change the color of the finished floor? Finally, how many coats will I need?