Translation of cautiousness in Spanish

Hello, I am John, I'm 29 years old, I have lived in Heidelberg all my life, I have a son and I am working at Lenzemanner in the South of Germany since 1980. I look forward to hearing from you.
Sorry that I answer so late but I was in Africa on vacation. What do you want to study in university? I think the most interesting are science studies, and it pays off, cause salaries are high.
If you are spell checking my letters, that would be great. I would then do the same with your letters. Can you please correct this email too? I thank you in advance for helping my Spanish.