It's easier once you are there. The map of the Louvre layout is not the best and when you get there you will find there are different levels and half levels that are all, say, listed as Level 1.
You may have found the official map.
https://api-www.louvre.fr/sites/default/files/2023-07/BAT-EN%20LOUVRE_PlanG%20-%20MAI%202023.pdf
Either the Pyramid or Carrousel entrance will lead you to the main area right under the Pyramid and from there you will take escalators up to the Denon wing. There is another entrance called Porte des Lions but it is often not open so don't even mess with this. The Richelieu entrance is for groups. Once you enter the Denon wing there is signage for La Joconde with her picture so you just follow that to the room where she is located. There are plenty of guards around so you can ask if you need help. DO try to get there at the opening time and yes, head straight there.
Here is a suggestion:
From Mona Lisa, head toward through Gallery 712 which is behind the Mona Lisa, then across the end of the square thru 715. This leads you to a stairwell in which there is a small cafe. IF you are going to spend the whole day there I do suggest you have some built in breaks. Maybe an espresso and croissant, lol. From here head thru the French paintings corridor. That takes you to a stairwell that does down to the Winged Victory of Samothrace (which you will have passed once when you came up the stairs and turned toward Mona Lisa. Standing in front of the Winged Victory, go to the left this time and the Gallery of Apollo is more or less behind this sculpture. You will loop back around (sometimes they have it set up so there is one-way traffic thru Gallery of Apollo so you exit, go back to the right and back in front of Winged Victory). Up, past Gallery of Apollo and then you are in the Sully Wing. You've got Greek and Egyptian antiquities on this floor. If you want to head straight to Venus di Milo, however, take a left into room 663, then take the stairs down a level. Come back in the same direction and that puts you right in front of Venus. With your back to her, walk thru this gallery, then take the half flight of stairs which is on the left which puts you in front of the Sphinx. From here, take a quick turn around the Medieval walls/foundation of the palace, return to the Sphinx and go up the opposite stairs.
This puts you into more Egyptian antiquities and if you follow the square you go around to Code of Hammurabi which is located in Room 227. Of course Rm 227 doesn't show on the Louvre map (?!?) but head for the vicinity of 226-230 and it's in one of the galleries along the outside wall.
From here, you are in the Richelieu wing which (yea!!) has escalators. I suggest you take these to the top level. See the Vermeers and Rembrandts if they are of interest, then work your way down thru the Napoleon III apartments. IF you want to see a few Impressionist paintings there is, surprisingly to some, a gallery with some works by Monet, Degas, Renoir in Room 903, Level 2 in the Sully Wing.
Here is a link to how to search the collections if you want to search for a specific piece or artist.
https://collections.louvre.fr/en/
This is one of my favorite museums. I have been determined thru the years to "conquer" it, lol. It still gets the best of me! My favorite single piece is the Vase d'Alienor, a rock crystal vase given by Alienor d'Aquitaine to her first husband who became King Louis VII in 1137 on the occasion of their wedding. Next favorites are the Vermeers.
Here also is a list of galleries and their closure days.
https://www.louvre.fr/en/visit/list-of-available-galleries