I took the first question about Maria and Ana and conjugated the word soy which is the word you use, do your best to apply the right version into the sentence based off the information given below.
Yo soy
Tu eres
Él/Ella/Usted es
Nosotros somos
Vosotros sois
Ellos/Ellas/Ustedes son
The conjugations are for different pronouns. When you are talking about a person such as Carlos you'd say Carlos tiene because it's similar to saying he has. Basically when you have names you have to think about it this way "if I didn't have names how would I describe this person/people?"
Also, sorry about the lack of accents.