The fastest and easiest to start talking about the future is with the verb ir. Forming the future with ir is a matter of knowing it's conjugation in the present tense.
In English we say, I'm going to do something, she’s going to do something, we're going to go somewhere and so on to express the future. It's the same in Portuguese. The verb ir gets conjugated in it’s present tense like this:
Você, ele, ela vai
Vocês, eles, elas vão
|I go||eu v||ou|
|you/he/she goe(s)||você/ele/ela v||ai|
Here’s how to talk about the future:
All of these examples use ir followed by another verb in the infinitive. But you can still talk about the future even more simply, without any other verbs at all.
Brazilians like to keep things simple qand leave out the subject altogether -- especially if the context is already obvious.
In Series 1 we use this method of expressing future action exclusively. In Series 2 we continue with this method as well. That's because it's by far the most common. Another verb conjugation called the future of the present exists, but is used mainly in written Portuguese and almost never, ever in spoken conversation.
IR in it's infinitive form is a little strange to pronounce. Brazilians say it using their nose, making a nasal EEE. The conjugation in the present tense is obviously easier, but you should still give a listen to the video posted above. It's a perfect example of the conjugation.