Mexican bonds & transactions fees

Hi everyone! Happy to be here and to ask my first quesion. I just finished the course to invest in index funds and I have two questions.

  1. I am mexican so I want to invest in mexican bonds. The interest rate is 7.35 for 20 years. One thing I don’t undersand I how to invest a monthly amount in bonds. Do I simply need to buy an individual bond everytime or could I just buy the corresponding amount for each year according to my three-fund percentages?
  2. I found a good broker for mexico but they appear to charge 0.10% per transaction. Is this good or bad?

Finaly, is any bond ETF or bond index fund good as long as the expense is below 1%?

Thanks in advance, I hope I made myself clear :smiley: