Translation of Dienstleister

I have considered the option to bring my friends from other social networks and invite them to join here. They can develop better language skills here. I'd love to pursue that goal, but I want to write in English.
Thank you for your email! A little question about yourself. How old are you? I think the Americans are using the word color and not colour, but I understand if you are not sure about it.
Tomorrow I have my test, so I have to practice a lot, but it should have started to study much earlier. I can only act under time pressure, I'm just like that... . I am 25 years old and I am married.