How do you say hi in French

Could someone who speaks french look over some text i wrote to see if it is correct? my meal: je vais manger les 4 morceaux de poulet mccroquettes et le biscuit de l'omrm aux morceaux de chocolat. je vais boire l'eau dasani. le repas contient 330 calories. my friends meal: mon amie va manger le wrap-éclair au poulet grillé avec sauce chipotle et le biscuit de l'omrm aux morceaux de chocolat. ils vont boire le jus d'orange minute maid. le repas contient 570 calories. i am ordering items from mcdonalds and stating how many calories are in each meal.

In this french correct ? i dont know if the person i am talking to is a female or male im assuming that wouldn't affect it but i kind of forget . i know all adjectives agree with the nouns that they modify. métier is masculine so i use the adjective bon and bon is masculine so i use un? is that how it works je pense un bon métier pour toi est un artiste ou un architecte. i think a good job for you is an artist or an architect

3. why is it important for a firefighter to know another language?