Hi Hirome you can say: It will be my first time visiting Brazil. or It will be my first time to visit Brazil.

A quick search of both "first time to visit" and "first time visiting" reveals that both are correct and native. However, "visit" needs a direct object, so "visiting Brazil" or "to visit Brazil" is what you need to complete the sentence.

Both are correct. The first one is a continuing tense, acting on a future event as if it is happening now. The 2nd one is a simple future tense to mean that you are going to do it sometime in the future.

Correct: It will be my first time visiting. Incorrect: It will be my first time to visit.

It will be my first time visiting Brazil. Visiting means " to visit"