self introduce for a interview

I will go to a interview which need some spoken English.so I want to prepare in advance.please help me to make it more native.
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Hello!  my name is Heather.  I'm good at designing and drawing. I have been  learn studying western painting  ( sketching, opaque watercolor painting) for three years.I was always (a model for painting or painted a lot?) for painting ( ?)my class when I was a student.  I like art and I've decided  to choose designing as my career.I have a lot of experience in graphic design. I think I can be competent for this job (why? any certificate or experience?).i am so glad to come Thank you for inviting me to this interview and I'm looking forward to working for your company. 

P.S. what exactly do you mean by cadres?

 How can you prove your experience? this would be helpfulto finalise the letter.

Моя семья

Я думаю ,что у меня есть большая семья. У меня есть две сестры, мама, папа, и мои дедушки у бабушки. Я жил с ними когда я был в университете, но сейчас я живу одно один. Когда я успеваю будет возможность или в мой день рождения, я хотел бы вернуться в деревню,чтобы увидеться  с семьюей и мы будем приглашать  провести время вместе. Будет отличный праздник!

жирная пища - fatty food

Work for tips or salary? (In the US)

I'm looking for some advices about this  these jobs. Next Ddecember i'm going to go to the US and  I will work there for Work and Travel. aAnd I don't know much of what is the best. So I'll be grateful if some of you can tell me about your experience.  What job I should  I take to do much to make a lot of money.

Thnx!