Ah, you have chosen to try your hand at the hardest thing that a beginner can attempt!
I could not do much with the file as there are no ref images attached to the file but I added some faces to help you on your
way, I have switched the faces as well, as they were blue, whereas they should be yellow.
The ref images are hidden in my file attached just use the h key to reveal. Shift/h hides them again in object mode,
I have also subdivided the faces so that you can see the difference when applied
To get back to your original mode, double click on the object and change the divisions working 2 and final 3 in popup, to 0 and 1
then use Menu/Build/Convert to mesh.
Good luck with your projevt, if you need any further assistance then please let me know.