My income will increase to 771.00 total on jan 1 but I get paid on the first and the 15 th of each month how much will I receive for the first and the 15th of each month?

Divide $771 by two?

You will not see the raise in the first paycheck. You are not paid in advance, typically 2 weeks hang time. So, for the first paycheck of the year, you will get what you were paid for the last 2 weeks of 2018. Your first paycheck of 2020 will cover the last 2 weeks of 2019.