It's the same as English.
numbers sounds like 1-un (un) 2-deux (duh) 3-trois (twah) 4-quatre (catter) 5-cinq (sink) 6-six (sees) 7-sept (set) 8-huit (wheat) 9-neuf (nerve) 10-dix (dees) 11-onze (ohnz) 12-douze (dooze)...
shirt
"Chemise" is already in french. It is: "Shirt" in English.
French is "français" (feminine: française; plurals: français/ françaises). Here the word français is an adjective, so use a lower-case f. A Frenchman is 'un français', a Frenchwoman is 'une...