Install the walls first to within slightly less than one full tile for the bottom row after considering what will be the finished height when the floor tile is installed. This way you won't be working on top of the new floor tile. Set a ledger for the starter row and use spacers as the tile progresses upward.
After the walls are in then install the floor tile.
Go back and cut to fit the bottom row of wall tile to the floor leaving a 1/8" gap for caulk. At this time any irregularities in the floor can be considered when cutting-in the final wall tiles.
Grout everything and be sure to dig out any grout that gets into the wall/floor juncture. When the grout is dry, caulk that juncture with grout-matching caulk.
In the case of cove-base tiles they can be done using more than one method. One style tile allows you to tile the floor up to the cove base after it is installed. Another style cove-base dictates that the floor tile be installed first.
If the base tile is to be installed on top of the floor tile, the wall tile can be installed first leaving out (two) bottom rows. Then the floor tile, then the cove base. Then the remaining second row up of wall tile can be cut to fit the cove-base that is sitting 1/8" above the floor tile. Not all tiles lend themselves to this method.
There is a lot to be considered and some accurate math is involved sometimes.
